I picked up a pair of Wallter Kidde 38s, stamped 1963. With 3/4-14 pipe threads I'm hoping to reuse these tanks for sidemount. They appearsto have a liner. It's not the kind I've seen in the past though. Is this plastic,, epoxy, or paint? Is a tumble the only way to remove it? Would any chemical treatment work. like paint stripper?
There's a local fire services guy who will tumble and hydro for $100. It seems like a lot.