Painting Galvanized Metal Roof?
It may be slightly OT here, but it's a "Tech Issue" and I'm betting someone here can help... I put a galvanized metal (the old 5-V "tin" roof) on our farmhouse when we moved into it almost 35 years...
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MEXICOWANDERER wrote:
Dale Erb used an acid wash followed by Zinc Chromate on Quicksilver where every inch was hot-dip galvanized. Then came a green tie coat then white primer. Another painter finished it IMRON. 22-gallons worth. Silver with blue metalflake and abalone iridescence. Murals by "Cue Ball"
Was nice when I had industry contacts and a 100K plus income back in the eighties.
DING! DING! DING!
We have a winner!
The KEY to success is proper preparation, the only true way to get paint to stick to galvanized metal is to acid etch then laydown an intermediate primer.
Zinc Chromate is the intermediate primer, skip these two steps and your paint WILL be peeling shortly after it has dried.
Learned that lesson over 35 yrs ago working on my first car from the early 1970s which the factory had used galvanized steel on the cowl under the windshield.. Couldn't get paint to stick for long until we asked the auto paint store and they sent use down the correct path..
