Perhaps Imron or similar 2 part Epoxy clearcoat?The sax was coated with some aerospace type clear. Powder coated ? It wouldn’t come off with anything. Not even heat.
I now have a 2nd Bundy II alto, a bit weird type of tarnish scattered completely through the entire horn body, each about a quarter's diameter apart from each other and about 5 - 10 mm in diameter. It is like the body is diseased. Bundy Pox? I thought I might strip it to bare brass and clear coat with one of the rattle can Rust-O-Leum Commercial clear coats.
It is mine and I can do whatever I want with it!

