Technical - Zinc Chromate Primer Question

My dad was cleaning out the attic of the garage recently and found this Aero Klad zinc chromate primer along with some Imron so he brough it over

BRAND: Marpro, DESCRIPTION: , - Zinc Chromate Primer, - 12 oz Can., - Color: Yellow, - Aerosol Paint for boats, engines, lower unit, FEATURES

Marpro 18884 Spray Aerosol Paint Primer 12oz Can YELLOW Zinc Chromate Marine

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Epoxy Primers LAS Aerospace Ltd

Teamac QD Zinc Phosphate Metal Primer

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SO-SURE PRIMER TT-P-1757, Type II, Class C, Color Y - Deep Yellow

MOELLER MFG. COMPANY, INC. ZINC Chromate

Eastwood 16058 | Hotcoat Zinc Rich Primer Powder CoatHelps color powder coats bond to the part being coated.Eastwood - 16058 - FeaturesHelps color powder coats bond to the part being coated. While all Eastwood Powder Coats can be applied directly to a bare metal surface without the use of a primer, certain projects demand increased corrosion protection.

Eastwood 16058 | Hotcoat Zinc Rich Primer Powder Coat | Auto Tool World

What is the difference between zinc chromate primers, wash primers

SO-SURE Aerosol Primer Paint - TT-P-1757B, Zinc Chromate Metal