Troutmaster
Contributor
To the op, do what Jim said (generally a good policy). Get a hydro/vis where ever is cost effective, and dive those tanks until they wear out, which will be never.
Do not replace the valves, if there is something wrong with one, have it fixed, but those tank valves are fine.
I would not bother removing the old paint unless it is required by who ever is doing the vis. I would certainly not waste any time or money puting any paint ON the tanks. Tanks get banged around alot (mine do at least) and pretty tanks don't work any better than ugly ones. Plus if the paint is nice, you feel bad if you chip it. If I chip the paint on one of my tanks it would be really hard to tell where the new chip was (unless it knocked off some dirt, then the clean spot would show)
Do not replace the valves, if there is something wrong with one, have it fixed, but those tank valves are fine.
I would not bother removing the old paint unless it is required by who ever is doing the vis. I would certainly not waste any time or money puting any paint ON the tanks. Tanks get banged around alot (mine do at least) and pretty tanks don't work any better than ugly ones. Plus if the paint is nice, you feel bad if you chip it. If I chip the paint on one of my tanks it would be really hard to tell where the new chip was (unless it knocked off some dirt, then the clean spot would show)