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This is the best rust converter we've found.
Using Picklex on Sheetmetal:
Picklex gets sprayed straight from the bottle onto the metal. Spray about two or three square feet at a time then work it in with a scuff pad then wipe it with paper towels. Allowing a thick film to dry will work against you in the long run so wipe it off then allow the surface to dry.
Before I apply primer I like to scuff the dried Picklex with either sandpaper or a scuff pad to break the glaze then I apply epoxy primer. Remember not to use primer that has acid in it, this means no etch prime or anything else with acid.
Picklex 20 Technical Info Link | 
