Topic: Re: Acid wash
|Antique Tractor Paint and Bodywork|
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Use wax and grease remover as the final step, not mineral spirits. Ok to use mineral spirits before wax and grease remover. As to your acid, although I have done it once, I do not recommend H3PO4 on any kind on cast, it may get in the pores and lift the paint later. The one time I did it with Picklex 20, it did not lift. If you insist on it, repeatedly use about any cleaner to try to get it out of the pores followed by wax and grease remover. Looking at your picture, you used far too much acid. It does not take much. The "dirtier" the cast, the more white residue you will have. On clean sheet metal, for example, there is very little. Using a product such as Picklex 20, which is a mild version of H3PO4 the white residue can be mostly removed with a scotchbrite pad, followed by wax and grease remover. After I had painted my 1st tractor, it dawned on me that I do not need any form of H3PO4, because I live in a dry climate, and I simply do not get rust on bare metal inside my shop.
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