Patent ID: 8790780
Filing Date: 2014-07-29
Classification: C09D,F24F,Y10T

Abstract:
1. A cast-in-place composite coating system applied to a drain pan of an HVAC or an air handling system to reconstruct or repair the drain pan, the coating system comprising: an epoxy base coat applied to the drain pan and configured to fill holes or crevices therein, thereby arresting corrosion, restoring surface structure, repairing and reconstructing the drain pan; the epoxy base coat being substantially free of volatile organic compounds and building up the drain pan for proper sloping and drainage of condensate water; a waterborne intumescing combustion barrier intermediate coat applied on the epoxy base coat that provides a barrier to combustion of the epoxy base coat by expanding and forming a dense structural foam layer; and a sealer coating applied to the intermediate coat for water resistance; wherein when the epoxy base coat, the combustion-barrier intermediate coat and the sealer coating, are applied to the drain pan, they form a reconstructed or repaired drain pan which is sloped for drainage, thereby precluding the ability of water to pond within the drain pan and thus retarding or eliminating corrosion and microorganism growth.