
By now it is quite brittle and will break off in chunks revealing fresh clean mild steel panel - reminds me of house painters gap filler.
I have found a post elsewhere describing removal by 1500C heat gun. I am wondering if it needs that, or will a chemical approach work - some sort of solvent ?
Any knowledge imparted is appreciated

I have a near rust free halo to remove from a wreck, and believe it is only spot welded at the sides, the rest of it bonded ??