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Cement to Resist Petroleum

A cement peculiarly adapted to stand petroof oxide of zinc, mixed with size, made up like a wash, is first laid on, and over that a coat of chloride of zinc applied, prepared in the same way as the first wash. The oxide and chloride effect an immediate combination, and form a kind of cement, smooth and polished as glass, and possessing the advantages of oil paint without its disadvantages of smell. 2172. Coppersmith's or Blood Cement. Bullock's blood thickened with finely leum or any of its distillates is made by boil- powdered quicklime makes a good cement to ing 3 parts resin with 1 caustic soda and 5 water. This forms a resin soap which is afterward mixed with half its weight of plaster of Paris, zinc white, white lead, or precipitated chalk. The plaster hardens in about 40 minutes.