I sand blast the tanks as wire brushing typically can't get to all areas that need attention. Then blow off the sand, use prep-sol to clean off any remaining, and paint. Will be like new.
The sand blasting is a good sized project so I do big under areas when I am at it.
If the tank was only minor surface rust, I wouldn't worry about testing it. If the rust was significant, then replace the tank and not worry about testing the new one.
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2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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