Corbel Polyurethane Decorative Faux Wood Knee Brace FDCM 60

4-1/2" Wide x 9-3/8" Height x 18-1/4" Projection. The secret of Polyurethane is its closed cell structure. This makes it very stable and keeps moisture from migrating behind coatings. Moisture migration causes serious problems in wood building products (such as wood beams or molding), promoting paint failure and rot. Because of the closed cell structure of Polyurethane, paint tends to last longer and not be lifted off by moisture.