Paint that does not adhere to galvanized sheet metal surfaces (for example, drain pipes).
Causes:
Covering a galvanized metal surface with a simple alkyd paint;
Failure to previously treat new, glossy galvanized surfaces (with sandpaper).
Solution:
The galvanized metal surface must previously be primed with a special metal primer. Then paint the surface again using a simple alkyd paint. To improve paint adhesion, glossy surfaces must be made rough using sandpaper.