Man O' War marine spar varnish gives the ultimate protection to your interior and exterior wood surfaces. Unlike polyurethane clear finishes which become brittle， crack and peel when used outdoors， this marine quality varnish remains flexible and absorbs the expanding and contracting seasonal movement of the wood. This clear finish is formulated with ultra violet absorbers to resist the sun's degrading rays and protect the woods natural appearance. This tough finish is ideal for heavy use surfaces.