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Re: Lye Stripper rust problem

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Author  [Modern View]

09-15-2013 18:11:01

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Get phosphoric acid instead of vinegar. The phosphoric will convert the rust to black inert iron phosphate. Keep it wet with the solution for fifteen minutes. You can expect some residual white powder from excess phosphoric acid but you pressure washer should remove it. You can get it at any dairy supply or restaurant supply.

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E Sturm

09-16-2013 14:23:07

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 Re: Lye Stripper rust problem in reply to showcrop, 09-15-2013 18:11:01  
Thanks for the info. Is there anything that will just wash off the rust as the vinegar did or is it necessary to convert it as you indicated with the phosphoric acid. I assume you meant that the phosphoric acid would covert the rust completely. Will the surface take primer and paint with the rust converted?

I had the truck down to bare metal with just a few old rust spots on it. After the vinegar, the rust is completely covering the truck. I guess my question is, is there something that will remove this flash rust? I"m new at this sort of thing but was impressed by the paint remover but disappointed about the vinegar. I guess I should have skipped that step. lol

Thanks again for your help.

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09-17-2013 18:16:45

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 Re: Lye Stripper rust problem in reply to E Sturm, 09-16-2013 14:23:07  
Quoting Removed, click Modern View to see

Yes, it is called acid wash. It is phosphoric acid. You need it to neutralize the paint remover, and conveniently enough it also cleans up the flash rust. When I painted my dump truck body I followed up the acid wash with a liberal application of final prep.

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