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The Caswell epoxy does not require sand blasting. Just wash it out good with degreaser and hot water. Then I use a metal treating acid, same as you would use to etch metal prior to painting. You could also use muriatic acid and water to etch it a little. If there's loose rust in it you can throw...

Unscrew it.... Probably tight but both of them are just screwed in to fittings that are soldered and riveted to the tank.

Hello, Don't heat the threads, the fittings are riveted and soldered to the tank, you'll melt the solder out. I've always been able to get them unscrewed despite the rust. Sometimes they are pretty tight and need a few wacks with a dead blow hammer on the wrench, but they have always come out...