Posted by showcrop on November 04, 2012 at 18:56:52 from (188.8.131.52):
In Reply to: clean rust pits? posted by Jr. Roby on November 03, 2012 at 19:06:59:
You want phosphoric acid. Google it. It tells you about how it forms a protective film. You can get it at an auto parts store under many different names or spend 1/4 the money and get it at a dairy supply or restaurant supply where they sell it for removing mineral film. I spray it on, keep the part wet for 15 min, then rinse off well. I also use a bucket to dip small parts for 1/2 hour or so then rinse in a second bucket for ten min. It will get right down in the pits better than sandblasting to dissolve the rust.
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