cannabineer
Ursus marijanus
I learned of it as a way to bond UHMW, one of the least gluable polymers. In my hands it was better than mechanical roughening. As for finish quality, I confess apathy.I've literally never even heard of torching plastic to prep it for holding plastic bonding spray paint before. I don't know how you'd get a good smooth or at least good looking surface that way at all..