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Did you use a roll on primer or spray on




I rolled on the primer. The primer is Rustoleum as well, says on the label that it's ok for anything (paint, wood, metal); I figured if I was going to sand the rust down to metal but only "rough up" the rest of the paint, that it'd be the perfect primer. Keep in mind that primer is, at best, a temporary stage. I forgot that (I let the car sit for more than three weeks) and developed some rust patches even under the primer. I guess it's also possible that I didn't roll it on heavy enough.

In any case, I ended up sanding the roof with 400 and doing another coat of primer, about two weeks before I put this first coat of blue on.

It says earlier in this thread that you can put the alkyd enamel Rustoleum over anything, so I'm not really worried about the rust patches. The primer was more so I could get an even color on the car, as well as allowing me to sand to metal the surface rust.