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) is suitable for use in combination with Osmo products.
