Zinc-Rich Paints
Zinc-rich paint is applied to a clean, dry steel surface by either a brush or spray. Zinc-rich paints must contain either between 65% to 69% metallic zinc by weight or greater than 92% metallic zinc by weight in the dry film. Paints containing zinc dust are classified as organic or inorganic, depending on the binder they contain. Inorganic binders are particularly suitable for paints applied in touch-up applications of undamaged hot-dip galvanized areas.
The coating thickness for the paint must be 50% higher than the surrounding coating thickness, but not greater than 4.0 mils, and measurements should be taken with either a magnetic, electromagnetic or eddy current gauge.
What types of paint and paint brand names work well in covering galvanized metal?
The AGA does not specialize in paint, so we do not recommend any particular type of paint; however, the AGA publication, ‘Duplex Systems,’ does give the compatibility of different types of paint applied over hot-dip galvanized steel at the top of page eight. Here is a link to this publication - http://www.galvanizeit.org/images/uploads/publicationPDFs/Paint_Over_Galvanized_Steel_Duplex_Systems.pdf.
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