I want to check that I have the right procedure for dealing with superficial rust on my galvanized steel roof. I understand that the sequence is sand the rust off, wash with water, apply rust killer (phosphoric acid), prime, paint. A couple of questions: Is it possible to use the rust killer without sanding? The sanding step is the hardest. Is primer necessary, or can I use another layer of the top coast?
- posted
11 years ago