Painting rusty spots on roof
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?
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