Posted by CNKS on August 20, 2012 at 19:01:43 from (216.144.104.128):
In Reply to: Opinions before I paint posted by David Beasley on August 20, 2012 at 18:48:04:
I can't recommend phosphoric acid on cast as it gets in the pores. You may want to wash it with soap and water if possible and dry it before you get flash rust. It may take several washings, then use repeated applications of wax and grease remover. Either sand the rust off the sheet metal or use a fiber brush on an electric drill, which is much more effective. It will leave deep scratches that can be partially removed with 150-180 grit sandpaper. If you are afraid of rust use Picklex 20, which acts as a preventative and also gets rust in the pits, if any. It will leave some residue that can be sanded off, then use wax and grease remover. Don't use etch, use two coats of epoxy primer followed by sandable surfacer, which will fill the scratches. Absolutely do not use etch on the cast. The amount of phosphoric acid left will combine with the etch and likely will lift the paint. No I don't use ospho, it is too strong, Picklex is a much better and safer product -- but I don't use it on cast either.
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