Posted by CNKS on May 27, 2012 at 07:41:36 from (216.144.104.128):
In Reply to: Primer paint posted by AllisG on May 26, 2012 at 20:54:18:
NO. Your best bet is to remove the rust mechanically. On sheet metal I use a fiber wheel on an electric drill. It gets all the paint and rust off. If you are afraid you don't have it all after that, or you want to protect the metal until painting, use Picklex 20. It will leave a harmless white residue that can be removed by scuffing with a scotchbrite pad followed by wax and grease remover just before painting. You do not need to wash it off. Somewhat more complicated is cast, which is harder to treat. I use a wire wheel on an angle grinder and get off all I can. If the parts can be sandblasted I do that, but not the whole tractor. I am hesitant about using Picklex 20 or any other Phosphoric acid mixture on cast because it gets in the pores and "may" lift the paint later -- I have done it once without problems with lifting. However if you use it on cast it makes it virtually impossible to get the cast clean, that is it reacts with the cast and you are trying to remove the black deposits for hours afterwards. So I just clean it after the wire wheel. Come to think of it I did have to repaint the torque tube/clutch housing on the tractor I used Picklex on 9 years ago, I blame that on the Picklex, but I have no proof.
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