Peeling From Galvanized Metal
Common Painting Problems
Paint that has been applied to a galvanized metal surface will peel for one of three reasons: either the galvanized metal was not properly primed, its grease film was not washed after it was manufactured, or, as in the case of metal eavestroughs, the metal over-expanded in winter months as water in them froze. Once bare, it is critical that exposed galvanized metal be painted, as the sun’s ultra-violet rays will degenerate the galvanization, and the metal will actually rust.
In order to avoid the need to replace rusted eavestroughs and downspouts, we will scrape and wirebrush all loose and flaking paint. Rough edges will be sanded, generally with steel wool. The entire surface will then be washed, and, once dry, all bare areas will be primed. We will prime with a primer that is formulated specifically for galvanized metal. .
Once complete, this process will last very well, but we are unable to guarantee it as we have no control over the harsh effects of snow and ice. (Metal reacts differently in the winter than most other painted surfaces) We suggest that, with annual clearing of eavestroughs, these galvanized metal surfaces will last as long as the rest of your paint job, and replacement can be avoided.