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...
Forum Discussion
Generally the problem with galvanized metal is that a layer of oxide forms on the surface which interferes with pain adhesion. You have to clean it off before you paint. It’s a lot of work, so I’d ask a knowledgeable paint dealer for recommendations for a cleaner. Likely a mild acid.
