Osmo products depend on penetration into the wood surface where they form a cross-linked chemical bond to the wood fibres. Penetration of the oil can be inhibited by not adequately preparing the surface and/or applying the oil to wood with a moisture content beyond 20% such as onto new pressure treated wood, or applying at temperatures under 15 degrees Celsius. We suggest allowing pressure treated wood to dry outdoors for a minimum of 6-weeks prior to finishing, and to allow any decking cleaned and stripped with a pressure washer to dry for 1-week.
