VSC ZINC ADDITIVE powder, when added to ARMOROCAT 65 or V-THANE coatings, acts as a sacrificing compound that protects the metal substrate from further corrosion, Zinc is well known to significantly reduce the rate of corrosion versus coating without Zinc. Excellent for prime coats and stand-alone coatings. Add 1 lb. per gallon of ARMORCOAT or V-THANE