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ASTM A780 says zinc-rich paints for repairing hot-dip galvanized damage must contain either between 65-69% metallic zinc by weight or greater than 92% metallic zinc by weight in dry film. Why is only 65-69% or above 92% accepted? Is any zinc-rich paint out of these ranges not suitable for HDG repair?

FEBRUARY 18 - FEBRUARY 21, 2020


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