| Osmo | FAQ

FREQUENTLY ASKED QUESTIONS

 

Q. Are your products suitable for veneered wood?

Most timber manufacturers advise that oil or wax treatments are not suitable for their veneered doors but they rarely explain the reasoning. Veneer is a thin slice of wood glued to the construction and following the absorption of an oil or wax treatment, there is a small risk of the glues delaminating from the veneer. However, Osmo Door-Oil is a recommended finish for interior veneered doors, especially those from Howdens Joinery and LPD Doors - thanks to the combination of oils and waxes which build a high viscosity and quality product with a low solvent content, thus avoiding the risk of delaminaton. Osmo finishes have been used for many decades on veneered surfaces without problems. Please always seek advice from the manufacturer and follow the instructions on the label and apply thinly. A trial application is always recommended.

For exterior veneered doors it is advisable to check with the manufacturer first, since Osmo UV-Protection Oil may be suitable if a clear/natural finish is desired. Alternatively, Osmo Natural Oil Woodstain offers a selection of colours. As a guide, the darker the colour - the higher the UV-resistance. Please always test application prior to use.

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Q. Why is the finish not drying? / Why is the surface still sticky after application?

Extended drying times and sticky surfaces are often the result of over-application. There are several other reasons as to why this may occur however, which all relate specifically to a lack of oil penetration. Osmo finishes must always absorb the surface of the wood. Please check carefully if any of the following is applicable:

  • Over application - a maximum of two thinly applied coats is recommended with brush or roller applications. A maximum of four thinly applied coats is recommended with cloth applications. Applying thickly or generously results in very little or no penetration, whilst an excessive number of applications leaves surplus oil to remain on the surface. Over-application not only extends the drying time, but also creates a sticky/tacky surface which attracts the likes of dust, dirt and lint. The surface may also become more susceptible to scratches and wear more quickly.
    Remedy: allow for extra ventilation and remove excess application immediately with a clean and dry cloth. If the excess has already dried, the use of methylated spirit helps to degrease the surface from the excess. Depending on the amount of excess, sanding may be necessary.
     
  • Previous treatments - varnishes, lacquers and other surface coatings block the absorption of oil into the wood.
    Remedy: sand the surface completely and re-apply.
     
  • Unsuitable for the wood - ingredient-rich hardwoods such as Teak, Mahogany, Iroko, Cedar etc. naturally contain a high amount of oils or resin, thereby the addition of further oil is likely to result in excess/surplus on the surface. Special products have been developed to absorb these types of woods, be sure that you are using the most suitable product for the wood it is being applied to.
    Remedy: for ingredient-rich woods used in the interior we recommend a very thin application of Wood Wax Finish Extra Thin 1101. Whilst for exterior use, a weathering period of at least 12 weeks is required to allow the natural extraction of the wood's content before a thin application of a suitable exterior product is possible. The weathering period is applicable to new (ingredient-rich) timber species, after installation and/or sanding.
     
  • Sanding too finely - when sanding, P120 is generally the most ideal finishing sanding grade to best prepare the wood's surface for application of Osmo products. A maximum grade of P240 is possible for cloth applications only. The use of finer sanding grades further closes the grain and reduces the surface porosity, thereby resulting with surface excess and extended drying times.
    Remedy: degrease the surface with methylated spirit to reduce any surface excess where possible, followed by sanding the surface using most suitable grade of sandpaper for the wood you have and for your choice of application method.
     
  • Conditions - the area of application must be well ventilated and in dry conditions. The ideal temperature for application is 23°C with 50% relative humidity. Lower temperatures and/or higher air humidity can increase drying times. 

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Q. What are the ingredients of your products?

Osmo products contain natural vegetable oils; linseed oil, sunflower oil, soybean oil as well as thistle oil. The interior range of products also contain natural vegetable waxes; carnauba wax and candelilla wax. Please refer to the product data sheet for a declaration of the product ingredients.

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Q. Why do some of the product labels say that the finish is 'satin' and some say 'satin-matt'?

Osmo initially used the terminology ‘Satin-matt’ for the labelling of products in the UK which provided a Satin finish. This is because the products are developed in Germany and is the result of a direct German to English translation of the term 'Seidenmatt'. We discovered that this caused confusion and from 2013 onwards, our Satin finishes have since been labelled 'Satin'.
We can assure you that any Osmo product that refers to the finish as ‘Satin-matt’ is an older can label but with the exact same finish as the current label 'Satin'. The products will always be universally identified by the product code (e.g. 3032 or 420) as labelling may change from time to time.

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Q. What is the difference between your clear and transparent finishes?

Our transparent finishes are colour shades which allow the wood's natural grain and other characteristics to remain visible, thus providing a 'transparent' optic.
Clear finishes do not contain any colour pigments and as a result provides the wood with a warm, rich and enhanced colour tone.
If an almost invisible effect is desired, please avoid using a clear finish and instead look at the possibility of using 3044 Raw for the interior or 429 Natural for the exterior. Always check the suitability of the product in combination with the wood it is being applied to and trial apply first.

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Q. Are your products fire resistant?

No. The dried finish of Polyx-Oil is classified as B2 (normal flammability) according to DIN 4102 regulations. Which simply means the speed of the surface spread of flame is not increased, nor decreased in the event of a flame. OrganoWood provide a fire retardant 01. Flame & Rot Protection which offers flame resistance in accordance to EN13501-1 and has been tested in accordance with BS476 Part 7 and the result was a Class 3 spread of rating. However, when used in combination with Osmo products the drying time may be increased. OrganoWood 01. Flame & Rot Protection can be purchased here.

For a Class 0 & 1 rating, we recommend contacting Envirograf on 01304 842555 for further information and recommendations. For further reading please view enclosed letter.

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Q. Can I mix your colour shades?

Yes, the colour tones within the same product range can be mixed to any ratio. For example, Polyx®-Oil Tints 3072 Amber can be mixed with either 3075 Black to darken the shade, or alternatively with 3040 White to lighten the shade.

Additionally, Osmo Wood Wax Finish, Country Colour and Natural Oil Woodstain can be mixed to any RAL or NCS colour tone as well as any of our historic/discontinued colour tones can be specially mixed, with an applicable mixing charge and a 2-3 week delivery time.

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Q. I want to apply a clear finish and also provide UV-protection, is this possible?

Yes, but only for vertically structured surfaces such as cladding, fencing, doors etc. Osmo UV-Protection Oils contain special ingredients which resists UV rays from the sun to a factor of 12 in comparison to untreated wood.
Horizontally structured surfaces such as decking and uncovered garden furniture allows rain to remain on the wood surface for potentially long periods of time, thereby reducing the UV resistance significantly, to the extent that we do not recommend using a clear finish on these types of surfaces unless a naturally greying effect is desired over time. UV-Protection Oil requires a minimum drip angle of 15°C to offer a suitable resistance.

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Q. What is the curing time for your products?

Polyx®-Oils and all other Osmo products have a curing time of approx. 10-14 days. During this time, we advise to keep floor traffic as low as possible and avoid covering the wood's surface (e.g. with a rug or mat) which can block the circulation of air and the curing of the finish - potentially causing discolouration.

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Q. Are your products compatible with sealants?

Osmo Gap Sealer (for interior) and Exterior Sealer are suitable sealers for use in combination with Osmo products, after drying which is typically within one hour.

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Q. When do you recommend to use a base coat or primer?

For interior use: Osmo Wood Protector is recommended for woods prone to moisture, usually in bathrooms or kitchens. It is not necessary to use on ingredient-rich hardwood species.
For exterior use: Osmo WR Base Coat is recommended for exterior coniferous wood species such as Pine or Spruce to deeply impregnate the wood and provide increased water protection. In addition it is recommended for use on all other surfaces prone to algae, fungi and mildew growth.

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Q. Where can I buy your products?

You can purchase our products from any of our suppliers within the UK & Ireland. Alternatively, should you have difficulty in obtaining any of our products you can visit our online store. To order products from outside the UK & Ireland, please contact Osmo Holz und Color headquarters in Germany on 00492581922100 or search through our worldwide partners.

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Q. How to prepare the wood surface for treatment?

Wood surface must be clean, dry and frost-free with a maximum moisture content of 20% (be cautious with woods with high moisture, such as green oak). Clean or slightly sand old microporous (oil-based) finishes or remove old varnishes and lacquers by sanding.
Sand carefully starting with a coarse grade of sandpaper depending on the condition of the wood and use the following as a guidance only for which final grade of sandpaper to use before application.

Prior to a brush or roller application

P100-120: for ingredient-rich hardwood species.
P120: provides best results for most wood species.
P150: for softwood species.

Prior to a cloth application
P180: for ingredient-rich hardwood species prior to a cloth application.
P200-240: for most wood species prior to a cloth application.

Ensure the area is well vetilated and in suitable climatic conditions before application. Always trial apply!

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Q. When do you recommend to use a base coat or primer?

For interior use: Osmo Wood Protector is recommended for woods prone to moisture, usually in bathrooms or kitchens. It is not necessary to use on ingredient-rich hardwood species.
For exterior use: Osmo WR Base Coat is recommended for exterior conferious wood species such as Pine or Spruce to impregnate the wood for increased protection.

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Q. I have a hardwood, which product do you recommend?

For ingredient-rich hardwoods (such as Mahogany, Teak, Iroko etc.) we recommend using Osmo Wood Wax Finish Extra Thin for interior wood. Although for most exterior ingredient-rich hardwoods we recommend exposing the surface to external elements of weathering for at least 12 weeks before application. The high natural oil content of these types of wood are likely to resist the penetration of any further oil until it has extracted the majority of its natural content during the weathering period. Although the wood is unlikely to grey during this time, it may be necessary to apply Osmo Wood Reviver to restore the surface before application of a suitable treatment.

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Q. How do I prepare the wood for re-application and renovating?

For renovating Osmo treated surfaces, no sanding is necessary - as long as you are using the same Osmo product that was used initially to treat the wood and within reasonable time. Re-apply onto a clean and dry surface, usually just one coat is required. Sanding may be necessary if the wood had not been well maintained and there are marks or scratches, two coats would therefore be recommended.

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Q. I need to use a silicone sealant, in which order do I use your product and the sealant?

Since Osmo products have been developed to penetrate the wood, it will not be able to do so through a silicone sealant. We recommend to apply our product directly onto the wood first and leave to dry, afterward you may use a silicone sealant or mastic.
Alternatively, an acrylic sealant such as Osmo Gap Sealer (for interior) and Exterior Sealer are suitable for use in combination with Osmo products.

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Q. How do I fill gaps and cracks in the wood?

Osmo Woodfiller can be used to fill gaps, splits and cracks in the wood. If you will be staining the wood afterward, we recommend to use 73001 Natural since this can be coloured to match the floor colour - trial application required!
Alternatively, choose from a selection of Woodfiller colours to try to match the existing wood's colour. For larger areas, a more suitable and accurate alternative to matching the colour is Osmo Wood Putty mixed with the sanding dust to maintain the wood's natural colour.

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Q. Can I use your products on top of other finishes?

Osmo products provide best results when applied directly onto natural wood.

Applying directly over other oil-based finishes is not recommended since the surface may not be able to absorb as much of the oil as expected, or applying directly over older microporous finishes may provide inconsistent results. We recommend to clean or slightly sand old microporous finishes, whilst surfaces treated with film coatings such as varnishes or lacquers must be sanded before application.

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Q. What sanding methods do you recommend?

Sand carefully starting with a coarse grade of sandpaper depending on the condition of the wood and use the following as a guidance only for which final grade of sandpaper to use before application.

Prior to a brush or roller application (most likely flooring)

P100-120: for ingredient-rich hardwood species.
P120: provides best results for most wood species.
P150: for softwood species.

Prior to a cloth application (most likely furniture and other joinery)
P180: for ingredient-rich hardwood species prior to a cloth application.
P200-240: for most wood species prior to a cloth application.

Ensure the area is well vetilated and in suitable climatic conditions before application. Always trial apply!

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Q. How can I stain my floor?

Osmo Polyx®-Oil Tints offer a range of lightly pigmented wood stains or alternatively Osmo Wood Wax Finish offers a large selection of highly pigmented wood stains. Choose the colour of your choice from either of these ranges - and apply thinly just one coat using a firm brush, followed 24 hours later with a final coat of clear Polyx®-Oil*.
*Note: When applying a white colour tone, we recommend a final coat of Polyx®-Oil Tints (3040 White) instead of clear, to be able to preserve the intensity of the white colour, without yellowing.

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Q. How do I apply your products?

Each product has a varied recommended application method as shown on the product's data sheet as well as the label of the can, which provides best results based on the purpose of the product. The following methods of application may apply:

  • Brush application: Apply thinly and evenly along the wood grain with a firm, high quality brush and spread well. Remove any surplus or excess with a dry cloth. Usually 1-2 thin coats are required.
  • Roller application: Apply thinly and evenly along the wood grain with a microfibre roller and spread well. Remove any surplus or excess with a dry cloth. Usually 1-2 thin coats are required.
  • Cloth application: Apply with a dry, lint-free cloth - thinly, throughly and evenly along wood grain. Remove any surplus or excess with a dry cloth. Usually 3-4 thin coats are required. Please sure to dispose of the cloth safely to avoid ignition.
  • Spray application: Apply with either a customary spray gun (nozzle 1.2-1.5mm, 1.8-2.5 bar), an airless or HVLP requipment. Apply swiftly in vertical sections along the wood grain.
  • Buffing application: Spread the finish evenly with a brush, roller or wide paint scraper or an Osmo Scraper. Wait approx. 30-60 minutes for the oil to absorb. Buff the surface with a single-disc machine using a white pad. Apply second coat spreading the finish evenly across the surface using a white pad. 2-3 coats may be required depending on the product being used.

    Always trial apply!

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Q. Which of your products can be spray applied?

A list of our sprayable products can be found here:

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Q. Do I need to sand between coats?

Sanding is not necessary between coats. However, de-nibbing with a pad may help to reduce any imperfections from the surface between each coat.

It is important to avoid the use of wire wool to carry out this task. 

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Q. Can I use a buffing machine to apply your products onto my floor?

A list of products which can be mechanically applied can be found here:

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Q. Do I have to use your tools to use your products?

Our application tools are recommended for use because they are designed for quick and easy application. Our products only require a thin application, for instance Osmo brushes are of the highest quality with firm and tight bristles, so that you can apply thinly, enabling the finish to be spread well and thoroughly, achieving the highest possible coverage.

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Q. How many coats do you recommend, can I apply more?

For roller or brush applications; a maximum of two coats is recommended. Our finishes are designed to penetrate into the wood, application of a third coat is unlikely to absorb.
For cloth applications; three or four coats is recommended. When applying with a cloth, most of the oil is taken off the surface at the same time, ensuring a very thin application process.

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Q. My wood surface is tacky after applying your product, why is this and what can I do?

Extended drying times and sticky surfaces are often the result of over-application. There are several other reasons as to why this may occur however, which all relate specifically to a lack of oil penetration. Osmo finishes must always absorb the surface of the wood. Please check carefully if any of the following is applicable:

  • Over application - a maximum of two thinly applied coats is recommended with brush or roller applications. A maximum of four thinly applied coats is recommended with cloth applications. Applying thickly or generously results in very little or no penetration, whilst an excessive number of applications leaves surplus oil to remain on the surface. Over-application not only extends the drying time, but also creates a sticky/tacky surface which attracts the likes of dust, dirt and lint. The surface may also become more susceptible to scratches and wear more quickly.
    Remedy: allow for extra ventilation and remove excess application immediately with a clean and dry cloth. If the excess has already dried, the use of methylated spirit helps to degrease the surface from the excess. Depending on the amount of excess, sanding may be necessary.
     
  • Previous treatments - varnishes, lacquers and other surface coatings block the absorption of oil into the wood.
    Remedy: sand the surface completely and re-apply.
     
  • Unsuitable for the wood - ingredient-rich hardwoods such as Teak, Mahogany, Iroko, Cedar etc. naturally contain a high amount of oils or resin, thereby the addition of further oil is likely to result in excess/surplus on the surface. Special products have been developed to absorb these types of woods, be sure that you are using the most suitable product for the wood it is being applied to.
    Remedy: for ingredient-rich woods used in the interior we recommend a very thin application of Wood Wax Finish Extra Thin 1101. Whilst for exterior use, a weathering period of at least 12 weeks is required to allow the natural extraction of the wood's content before a thin application of a suitable exterior product is possible. The weathering period is applicable to new (ingredient-rich) timber species, after installation and/or sanding.
     
  • Sanding too finely - when sanding, P120 is generally the most ideal finishing sanding grade to best prepare the wood's surface for application of Osmo products. A maximum grade of P240 is possible for cloth applications only. The use of finer sanding grades further closes the grain and reduces the surface porosity, thereby resulting with surface excess and extended drying times.
    Remedy: degrease the surface with methylated spirit to reduce any surface excess where possible, followed by sanding the surface using most suitable grade of sandpaper for the wood you have and for your choice of application method.
     
  • Conditions - the area of application must be well ventilated and in dry conditions. The ideal temperature for application is 23°C with 50% relative humidity. Lower temperatures and/or higher air humidity can increase drying times. 

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Q. Can I speed up the drying of your products?

Allowing for extra ventilation into the room will allow as much air flow as possible. Only natural air can help the drying process. We do not recommend to turn the heating up higher than normal room temperature since this creates a higher humidity and a reduced possibility of the finish absorbing the wood, this instead increases the risk of the finish drying too quickly on the surface instead of absorbing into the wood naturally.

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Q. I don't want to change the appearance of my wood, what can I use?

Oils such as the clear Polyx®-Oil accentuate the natural colour and grain of the wood (permanent wet-look).Polyx®-Oil Effect (3044 Raw) counters this exaggeration of the wood's colour, leaving the surface looking natural in it's new or raw condition. The finish is close to being invisible to the eye and retains as much of the wood's natural colour as possible. Suitable for interior use onto untreated or sanded wood only.
For exterior use, UV-Protection Oil Tints 429 Natural may be a suitable option, depending on the structure and species of the wood.

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Q. Can I apply your products onto my old and greyed wood?

All exterior wood greys over time during exposure to the sunlight. UV rays damage the wood lignin which results in fading grey discolouration of the wood. Osmo Wood Reviver Power Gel is highly effective when restoring the greyed wood fibres almost entirely back to the wood's original natural colour and character. Treatment with any of the Osmo exterior product range is recommended afterward.

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Q. How long before I can use my floor after application?

As soon as the Polyx®-Oil has dried after application of two coats, the floor can be used immediately with light traffic. However, the finish takes approx. 10-14 days to complete the curing process. During this time we do not recommend covering the surface with rugs or carpets etc. since this can cause discolouration of the wood underneath.

 

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Q. Can I apply a clear/natural finish on decking?

Osmo Teak Oil (007 Clear) is the recommended product to use to achieve a clear and natural finish on decking. Please note that this does not offer any UV protection. To protect the wood against greying, a pigmented finish such as any of the coloured Osmo Decking Oils or Osmo Natural Oil Woodstain is required.

 

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Q. How do I maintain my floor?

After treatment of Osmo Polyx®-Oil, we recommend to maintain your floor regularly with Osmo Wash and Care and occasionally with Osmo Liquid Wax Cleaner.

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Q. How do I maintain my worktop and furniture?

After treatment of Osmo TopOil, we recommend to maintain your worktop regularly with Osmo Spray-Cleaner and occasionally with Osmo Liquid Wax Cleaner.

 

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Q. How do I maintain my decking and garden furniture?

After treatment, we recommend to maintain your decking and garden furniture occasionally with Osmo Decking Cleaner. If your wood has faded and starts to discolour into a greyed effect, we recommend to use Osmo Wood Reviver to remove the grey and revive back to original colour. Afterward, re-application of a suitable treatment is recommended.

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Q. My exterior wood is old and greyed, how can I revive it to look new again?

Exterior wood can grey over time after exposure to the sunlight. UV rays cause wood the discolour and fade into a grey effect. Osmo Wood Reviver is designed to remove the greyed wood fibres to revive back to the wood's natural colour and character. Treatment with any of the Osmo exterior product range is then recommended.

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Q. How do I fill gaps and cracks in my interior wood?

Osmo Woodfiller can be used to fill gaps, splits and cracks in the wood. If staining the wood, we recommend to use the '73001 Natural' as this can be coloured to match the appearance. Otherwise, choose one of the other colours from the Woodfiller range to try and match the existing wood's colour. Alternatively, we recommend using Osmo Wood Putty which is to be mixed with the sanding dust when sanding the wood. This will achieve an exact match for the wood's natural colour.