| 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 so there is a small risk of the glues delaminating the veneer, after the absorption of an oil or wax treatment. However, Osmo Door Oil is a recommended finish for interior veneered doors as it is a product with high viscosity, which means that it is extremely unlikely to penetrate deeper than the veneer and therefore unable to cause any issues. Osmo finishes have been used for many decades on veneered surfaces without problems. Please always follow the instructions on the label and apply thinly. A trial application is always recommended.

For exterior doors, we recommend Osmo UV-Protection Oil for a clear/natural finish or Osmo Natural Oil Woodstain for a wide selection of colours. The darker the colour, the higher the UV-protection. We do recommend a test application prior to use.

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Q. Why are your products not drying?

Extended drying times can be caused from slow penetration of oil into the wood. There are several possible reasons why this could happen:

  • Over application - each wood can only absorb a certain amount, as excess application can cause the finish to dry on the surface - which can create a sticky or tacky surface. Remedy: allow for extra ventilation and/or remove excess with a dry cloth.
  • Previous treatments - varnishes, lacquers and other surface coatings can block absorption of oil into the wood. Remedy: sanding and re-application.
  • Unsuitable for the wood - ingredient rich hardwoods such as Teak, Iroko, Cedar etc. have a high natural oil content, and is unlikely to allow further absorption of oil if an unsuitable product has been applied. For these types of wood in the interior we recommend Wood Wax Finish Extra Thin. For the exterior, we recommend to exposure in situ to the external elements for a minimum of 12 weeks prior to application.
  • Sanding too fine - when sanding, P120 is the most ideal sanding grit to prepare the wood for roller or brush application of Osmo products. P220 is most ideal for cloth applications. Any sanding grades finer than this further closes the grain and therefore reduces the porosity of the wood's surface resulting in surface excess and extended drying times.

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Q. What are the ingredients of your products?

Our products contain natural vegetable oils such as linseed oil, sunflower oil, soybean oil and thistle oil - and our interior range also contain natural vegetable waxes such as carnauba wax and candelilla wax. Although the ingredients vary with each product, there is a declaration of the ingredients on each product's Product Information data sheet.

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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 term of ‘Satin-matt’ for the labels, as Satin-matt originally is the official name for a product giving a natural, low, subtle sheen. The UK industry has had a tendency over the years to shorten this to the nickname of ‘Satin’. Therefore, the labels have been adjusted to the terms and of the UK industry. We can confirm that any product with the label of ‘Satin’ or previously ‘Satin-matt’ both have the exact same finish.

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Q. How can your woodstains/colours be transparent?

Our transparent colour shades contain low pigment content which allows the the natural grain and characteristics of the wood to remain visible, thus providing a 'transparent' optic.

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Q. Are your products fire resistant?

Our products are certified as B2 rated for flammability. They do not speed up the surface spread of a flame - but nor do they slow it down. Fire Retardant UK manufacture a product known as 'HR Prof' which has been undergone high quality and strict testings in combination with Osmo products and although it provides fire resistance for the wood, it can result in slow penetration of Osmo finishes.

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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, Osmo Polyx®-Oil Tints (3072 Amber) can be mixed with the Osmo ®-Oil Tints (3075 Black) to darken the shade, or Osmo Polyx®-Oil Tints (3040 White) to lighten the shade.

Alternatively, our exterior products Country Colour and Natural Oil Woodstain can be specially mixed to any RAL or NCS colour.

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

Yes, but only for vertical structures such as cladding, fencing, doors and windows etc. Osmo UV-Protection Oils contain special ingredients which provides UV resistance as long as rain can run off the wood and avoid staying on the surface for prolonged lengths of time (not suitable on flat surfaces such as decking), it is suitable for window sills with minimum drip angle of 15°C

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Q. What is the curing time for your products?

Osmo Polyx®-Oil 2K (6125) has a special curing time of 4 hours, which means the floor can be used as normal after this time. However, the other Polyx®-Oils have a curing time of approx. 10-14 days. During this time, we advise to keep floor traffic to a minimum and to avoid covering the wood's surface as this will block the circulation of air, which can cause the surface to discolour.

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Q. Are your products compatible with silicone sealants?

As our product is designed to absorb the wood, it will not be able to do so through silicone sealants. We recommend to apply our product directly onto the wood first and leave to dry. After this, you can use a silicone sealant or mastic.

Although if you are using Osmo Gap Sealer (for interior) or Exterior Sealer (for exterior) then Osmo finishes are suitable for application after just 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 for ingredient rich hardwoods with a natural water resistance.
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. Where can I buy your products?

You can purchase our products from any of our suppliers. Alternatively, if you wish to purchase directly from Osmo you can do so from our online store. To order products from outside the UK & Ireland, please contact Osmo Holz und Color in Germany on 00492581922100 or search our worldwide dealers.

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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 before application starting with a coarse paper - final sanding grade for brush or roller application is between P120-150. For cloth-applications a finer grade is recommended between P180-240. Remove dust etc. thoroughly from the surface before application with a vacuum cleaner. Application temperature preferably over 5°C.

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

Osmo Wood Protector is recommended for woods prone to moisture, usually in bathrooms or kitchens. It is not necessary for ingredient-rich hardwoods.
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 exterior ingredient-rich hardwoods we recommend to allow the wood to be climatised for at least approx. 12 weeks whilst an impregnation is not necessary due to the wood's ingredients. The high natural oil content of these types of wood do not allow penetration of any further oil until it has been exposed to the external elements. The wood is unlikely to grey during this time. Although if it does, we recommend using Osmo Wood Reviver to restore the original appearance prior to 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. 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 then 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?

As Osmo products have been developed to penetrate the wood, it will not be able to do so through the sealant. We recommend to apply our product directly onto the wood first and leave to dry, afterwards you can use a silicone sealant or mastic.

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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 staining the wood, we recommend to use the '73001 Natural' as this can be coloured to match the floor colour. 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 match for the wood's natural colour.

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

Our products achieve the best results and the intended appearance when applied directly onto the wood. Applying over other finishes may be problematic as these may have worn in some areas more than others, resulting in a patchy or uneven appearance. We recommend to clean or slightly sand old microporous finishes, but varnishes and lacquers must be sanded prior to application.

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Q. What sanding methods do you recommend?

Sand carefully before application (sanding between coats is not necessary) starting with a coarse paper - final sanding for flooring P100-150. Sanding grades finer than P150 closes the wood grain, which slows the penetration of the oil. Final surface sanding P180-240 is acceptable for furniture and joinery that will be treated via cloth application only.

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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 just one coat using a firm brush, followed 24 hours later with a final coat of clear ®-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 retain the intensity of the white colour.

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Q. How do I apply your products?

Each product has a recommended application method on the Product Information sheet, depending on the use of the product. The following methods of application may apply:

  • Brush application: Apply thinly and evenly along the wood grain with a natural bristle, firm, high quality brush and spread well. Usually 1-2 thin coats are required.
  • Roller application: Apply thinly and evenly along the wood grain with a microfibre roller and spread well. Usually 1-2 thin coats are required.
  • Cloth application: Apply with a dry, lint-free cloth - thinly, throughly and evenly along wood grain. Remove surplus or excess with a dry cloth. Usually 3-4 thin coats are required.
  • 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 wide paint scraper or the Osmo scraper. Wait approx. 30-60 minutes for the oil to absorb. Buff the surface with a single-disc machine using a green pad. Apply second coat directly after this and spread the finish evenly across the surface using a white pad.

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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.

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

A list of our suitable 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 natural bristles, so that you can apply thinly, enabling you to 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, which is an extremely 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?

There are several possible reasons why this could happen:

  • Over application - there is a limit to the amount of oil that the wood can absorb, excess application can cause the oil to dry on the surface - which can create a sticky or tacky surface. Remedy: allow for extra ventilation to enable the drying, or remove excess with cloth.
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  • Existing treatments on the surface - previous varnishes or other treatments can block the absorption of oil into the wood. Please refer to our advice regarding wood preparation. Remedy: sanding and re-application.
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  • Unsuitable product for the wood - exotic hardwoods such as Teak, Iroko, Idigbo, Cedar etc. have a high natural oil content, and application of further oil can be problematic if an unsuitable product has been applied. For these types of wood we recommend Wood Wax Finish Extra Thin for interior use, or for exterior use we recommend to allow exposure to elements for at least 3 months prior to application, any exterior product would then be suitable.

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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 as this can cause the product to dry on the surface instead of naturally absorbing into the wood.

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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 raw or sanded wood only.

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

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 Power Gel 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 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 days to complete the curing process. During this time we do not recommend you to cover the surface with rugs or carpets etc. as this can cause the wood to discolour.

 

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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.