I was told by the company that we bought our metal garage doors from that we had to purchase this product along with a very expensive primer from Sherwin Williams to paint the doors or our warranty would be void. I am an interior decorator and this is the worst paint I have ever used! After three coats of paint and waiting three days in between each coat the paint is still tacky and the panels continue to stick together tearing the paint from the edges when we open the doors. I even went as far as putting wax paper in between them to help prevent it with no avail. And after three coats you can still see dark and light blotches all over the doors!