Abstract: A water-thinnable primer effectively adherent to rusted metal and other substrates and to a variety of top coats has the form of an aqueous emulsion or aqueous suspension of a vinylidene chloride-vinylchloride copolymer and an alkyd resin, the alkyd resin being present in the amount of about 1/6 to 1/4 by weight of the vinylidene chloride-vinyl chloride copolymer, about 3 to 5% by weight of triethanolamine oleate as ionic surfactant, a drying accelerator composed of at least one polyvalent metal salt in an amount of about 1 to 4% by weight, about 8 to 15% by weight of a coalescing agent, and about 30 to 70% by weight of a pigment, all based on the weight of the total resin content of the primer.

Abstract: A rust converting and rust inhibiting primer is disclosed which comprises an aqueous suspension or aqueous emulsion of an alkyd resin, about 150 to 275 parts by weight of pigment containing at least 50 parts by weight of red iron oxide pigment, the remainder being extender pigment, a drying accelerator for said alkyd resin composed of one or more polyvalent metal salts in an amount of about 0.5 to 1.5 parts by weight of said metal and about 1 to 7 parts by weight of a surfactant active as an oil-and-water dispersant or emulsifier all parts by weight being based on 100 parts by weight of said alkyd resin. The primer is compatible with a wide variety of coatings and can be applied directly to a clean or corroded surface of a metal.