Method of applying a polyurethane coating on engineered...

Details Method of applying a polyurethane coating on engineered... Method of applying a polyurethane coating on engineered...

B - Operations, Transporting

05

D

B05D 1/38 (2006.01) B05D 3/08 (2006.01) B05D 3/12 (2006.01) B05D 5/08 (2006.01) B05D 7/06 (2006.01)

Patent

CA 2269401

A method of applying a smooth thin waterproof coating on engineered particleboards including oriented strand boards, thereby permitting the use of such boards for applications wherein the boards are exposed to moisture, including, for example, foundation forms, roof sheathing, basement walls, etc. The method of this invention includes applying a thin liquid cementitious coating on a surface of an engineered particleboard having a moisture content preferably less than three percent, wherein the cementitious coating fills the interstices between the particles and coats the surface. The cementitious coating is then dried and the surface is abraded to receive a thin liquid curable polyurethane coating over the cementitious coating. Finally, the exposed surface of the polyurethane coating is heated to remove surface imperfections and cure the polyurethane coating. In the preferred method, the liquid polyurethane coating is heated and cured by applying an open flame to the surface of the liquid polyurethane coating which removes surface imperfections, such as bubbles, and simultaneously cures the coating.

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