Patent ID: 6220305
Filing Date: 2001-04-24
Classification: B05D,F16L

Abstract:
A method of forming a coated steel surface on a steel pipe, comprising:preheating the steel surface of the steel pipe to a temperature of at least about 55.degree. C.;applying a primer coating consisting essentially of a thermally-curable epoxy resin composition to the preheated steel surface, wherein the epoxy resin composition begins to cure upon application to the steel surface, and wherein said primer coating is applied in sufficient amount to provide a cured film thickness of about 0.5 to 5.0 mils; andapplying a preheated top coating consisting essentially of a water-resistant bituminous enamel overtop said primer coating prior to completion of curing of said epoxy resin composition, and cooling said steel surface, primer coating and top coating so as to form a waterproof coating on said steel surface of said steel pipe.