Jordan, the first cmp tanks I did myself. I simply cut the bottoms out with a zip cut disc, had them sandblasted inside and out, then welded the bottoms back in. The interior was full of loose crud but amazingly they did not have any pinholes as I did not even have to coat them. I tested them by filling them up with water and let them sit on some paper to see if they leaked. I even put a rubber bung in with a couple pounds of air and they were good to go. Afterwards I simply dumped the water and used an airline to dry them out. Cost was next to nothing.
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