Well today I got the tank cleaned, as well as I could. Lots of dried up fuel and rust. Attempted to order a Caswell Epoxy kit but they are out of stock until 11/30/22, per their website.
Can't even place an order for it, which seems strange! (Wanted to get the 15% off for their Black Friday sale.) Those kits are getting expensive!
Oh well, guess I'll order it on Wednesday.
Working on cleaning up the fuel level sending unit now. Then will work on the gas cap! Then on to the brakes, tires, forks, electrical ..........
You might want to try to derust before going straight to a liner. Get some phosphoric acid. Kleen Strip Concrete and Metal Prep from Home Depot. Fashion some good plugs first, though. Don't use the sending unit, petcock, and gas cap. And let the tank vent, because it will outgas. Dilute to fill the tank and it will be rust free in an hour or two. You can't derust through varnish, though, so be sure to get all that out first.