[SEL] Anyone Ever Used Phosphoric Acid to DeRust

[Paul Maples]

Folks I was wondering if anyone had used phosphoric acid to derust? I have some phosphoric acid and was thinking of using it in the bottom of my Stover Block (base) where the oil sump is. Over the years water had condensed in this area and there is a pretty good rust area for about 2" on the inside of the crankcase.

If anyone has used Phosphoric Acid I would like to know what strength you used, did you cut it with water, about how long did you leave it on the metal and what did you neutralize it with.

Thanks,

Paul