Here is what goes on.... I bend a thin wall brass tube to shape then I have
to melt the bending medium out of the pipe with a torch. * This causes a
black scaling to show up on the outside of the pipe. *To remove this I dip
the pipe in a 50/50 mix of muratic acid and water. *This in turn plates the
pipe with very thin copper that I have to buff off.

Would a paint stripping gun get hot enough to remove your bending
medium without producing scale?
--Glenn Lyford