I bought the same stuff from home depot( klean strip) ( phosphoric prep and etch). I use in on my tractor because I had a lot of rust on it before I sand blasted it. I blasted then took the klean strip and applied on tractor with a small brush like it said in the directions. The thing I noticed after letting it dry was spots that were like a white crusty film left on the top. I am a little concerened about this because if you try to wipe it off with a dry shop towel it kind of gets imbedded into the cast like writing with a piece of chaulk. This is my first time using this product and the first tractor restore. I am planning on just wiping it done with a wax and geese cleaner and then maybe mineral spirits right before paint day.
Re: Acid wash in reply to redman88, 03-18-2012 09:24:42
I will show a picture of the tractor after treating it with klean strip phosphoric and you can see all the white film on it and the blues and greens in the metal. I think the discoloration I'd due to the chemical reaction between the metal, rust and klean strip.
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