|
It sounds like the rust etched into the metal and caused the metal to be pitted. Unfortunately, the only way to resolve that would be to use a filler to fill in the rough area, sand and paint, or... if there is enough metal, you could grind the the rusted area as smooth as possible without sanding through the metal, then primer and paint. If you paint it with the pitting, it will mostly likely show throw. You can also try a filler type of primer which is thick and may fill in the imperfections before you paint.
|