MOPED ARMY

Honestly, for the trouble of actually sealing it, plus the bad results I've seen around here (the coating flaking off, not adhereing to the inside of the tank, etc), I don't think it's worth it. Once it's cleaned, just keep it full of premix and it won't rust. It's when they sit for months or years with an empty tank that it'll begin to rust.

If it's not leaking anywhere, just clean it.

If you're going to seal it, bite the bullet and do it right. Use Caswell. It works. F' all the other brands.

dont seal a tank that doesnt rust. especially if you're uncertain how to do it or it's an awkward frame. Even if it leaks, it's way better to braze (or have someone braze) it shut than try sealers. it's expensive, difficult and very likely to fail. Even the successful ones rarely last more than a few years and selling a bike it's a big negative - if i see some rando out there tried to coat a tank i'm backing right away.

Second the endosscope camera, that thing I got on a him and it's saved my butta few times, even had a magnet attachment i was able to fish a dropped bolt out of a closed engine case - game fucking changer.

New gasoline has ethanol which promotes water and creates condensation. New cars that use gas with ethanol rust from inside out. Gasoline without ethanol does not rust metal or if used with stabilizer additives to prevent moisture is preferred.