A PU liquid resin subfloor primer and moisture barrier for use when installing wood floors. Applied in two-coats by roller or brush, Lumberjack M.B Primer helps to provide good adhesion on most subfloor types, particularly on dusty screeds, and can be used as a moisture barrier on subfloors above 3% humidity. It is fully-compatible with Lumberjack wood floor adhesives and can also be used as a patching mortar for minor subfloor repairs. Coverage rates are approximately 10m2 from a 5l tin and Lumberjack M.B. Primer is fully cured in approximately 24-hours.