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I just bought 2 steel 72 tanks. One is galvanized and the other is painted. The painted one has surface rust in the boot area. How should I remove it and protect the surface after? Could I use a rust remover then sand the rest of the tank and paint it? Should I strip the whole tank with a chemical stripper? What products should I use? (product that I can find at the hardware store)? Is it ok to paint the galvanized tank too (so they match)?
Surface rust (outside) is no big deal to clean up. Light sanding or scrubbing should do the trick. I'd avoid any rust removers. I would not paint the galvanized tank, is does not need it and paint has a hard time sticking to it. Besides, tanks do not have to match
To be conscious that you are ignorant is a great step to knowledge.
Grit blasting will really clean rust from the pores. Start with a cold galvanizing finish. Rustoleum has a few, one matte and one with a little sheen. These are zinc rich coatings. There are other brands out there.
You can use this same finish to touch up any blems on the galvanized tank like a hydro stamp or big gashes that have not healed. Other wise leave the hod dipped galvanized au naturale.
My ever growing collection of assorted ramblings on scuba topics can be read here.
No sequence of classes will make a good diver out of you, if you aren't actively diving and practicing in the meantime.