Chrome plating and anodizing stopoff composition

Claim 1

A METHOD OF MASKING AND IMPEDING THE FLOW OF IONS ONTO AND FROM SELECTED PORTIONS OF SURFACES IMMERSED IN ACID ELECTROPLATING BATHS, ANODIZING BATHS, CHEMICAL ETCHING BATHS AND CHEMICAL MILLING BATHS, WHICH COMPRISES THE STEPS OF APPLYING A PLURALITY OF COATS OF AN ORGANIC SOLVENT SOLUTION OF A NON-AQUEOUS COMPOSITION COMPRISED OF A MAJOR PORTION, BY WEIGHT, OF A BLEND OF AN UNMODIFIED VINYL CHLORIDE-VINYL ACETATE COPOLYMER AND VINYL CHLORIDE-VINYL ACETATE COPOLYMER MODIFIED WITH INTERPOLYMERIZED MALEIC ACID, AND MINOR PORTIONS EACH OF CHLORINATED BIPHENYL OF 60% CHLORINATION, AN EXTENDER AND PROPYLENE OXIDE IN A VOLATILE SOLVENT ONTO SAID SELECTED PORTIONS OF SAID SURFACES, DRYING EACH OF SAID PLURALITY OF COATS BEFORE APPLYING A SUCCESSIVE ONE OF SAID COATS, THE RATIO OF THE INGREDIENTS OF SAID COMPOSITION TO THE UNMODIFIED VINYL CHLORIDE-VINYL ACETATE COPOLYMER BEING 1.5 TO 4.0 FOR THE MODIFIED VINYL CHLORIDE-VINYL ACETATE COPOLYMER 0.5 TO 2.5 FOR THE CHLORINATED BIPHENYL 0.5 TO 4.5 FOR THE EXTENDER 0.01 TO 0.9 FOR THE PROPYLENE OXIDE.