Zinc Chromate: For aluminum surfaces above or below the waterline. This powerful primer etches into the aluminum, forming a strong surface/primer union that is resistant to corrosion. For professional use only.
Zinc Phosphate/Cold Galvanizing: For steel and iron surfaces, especially welded joints above and below the waterline. This corrosive barrier contains 95% of zinc, for maximum resistance against solvents & abrasions.