Abstract: A coating composition includes 1.5 to 4 weight percent of a film-forming acrylic resin having an average molecular weight of from about 235,000 to about 285,000; 4 to 8 weight percent of a film-forming acrylic resin having an average molecular weight of from about 175,000 to about 225,000; 1 to 3 weight percent of solid caustic; and 75 to 85 weight percent water. The film-forming acrylic resins may be copolymers of alpha-beta ethylenically unsaturated carboxylic acid monomers and ethylenically unsaturated esters. A dried coating of the composition is water-soluble. A method for making the coating composition includes heating water from about 140 to about 200° F.