Protecting surface that has small surface rust already?

I used 400 grit paper to do some of my top,i sanded it down to factory primer,if u can do that,then i hit it with the primer forget what kind,ill hav to find it look it up,i sprayed it with the spray gun in a booth at my shop class!As for the glue i jsut used a scraper an spent about an hour or two going over all the glue,use a heat gun to help ya out with the glue!
MIKE