Non-stick coating system with two thin undercoats, the first being polysiloxane

A coated substrate comprising a substrate with multi-layer non-stick coating, comprising two undercoats, a primer, a topcoat, and up to one or more intermediate coats between the primer and the topcoat, wherein:

• the substrate is free of contaminants that would prevent adhesion of the undercoat,
• the first undercoat is applied to the substrate and consists essentially of polysiloxane resin and has a thickness in the range of 0.1-5.0 microns,
• the second undercoat is applied to the first undercoat and consists essentially of (on a weight basis after air drying but before baking) up to 8% surfactant, up to 20% fine-particle silica, the balance polyamic acid or polyamide imide, and has a dry film thickness in the range of 0.1-5.0 microns,
• the primer is applied to the second undercoat and comprises perfluorocarbon resin and at least one of polyamic acid or polyamide imide, polyarylene sulfide and polyether sulfone and has a dry film thickness in the range of 2-15 microns, and
• the topcoat is applied to the primer or the last of any intermediate coats and comprises perfluorocarbon resin, wherein the individual coating layers are partially dried between coatings, and the entire coating is cured together at temperatures above 416.degree. C. after all the layers have been applied.