Of course the new-used will be the more expensive route, I added that as a worst case scenario.
I’ve never used a remover, cleaner, sealer. So I can’t comment on that, but I did get a used 96 tank last year not because of a rusty one, but a significant damaged one. I had no choice. I think I paid $175, and it was a bad silver repaint, with poor cleared over, crooked decals.
But they are out there, but buy wisely. Anything over $200 is not a deal.
I stripped mine, with this stuff from HomeDepot. It was biodegradable and supposedly better than “harsher” chemicals. It worked well, needing a few applications, but worked.
The problem was what I found underneath it. Both sides had bondo, and it was in rough shape. So I re-did the bondo’d areas a little better (first time working with body filler ever), and did a quick prime. It’s a metallic blue now on my track bike, but it holds fuel without leaking, so it’s good to go.