Possibly. But it would at least blister the paint about which you're so concerned....
I know that big blast of flame is a gas, but yuz just gots to git a bit more creative. Why not RPG 'em with a fatal dose of laughing gas? It's quick, easy, doesn't hurt the paint, and the folks downstream would get a nice buzz. Even the FDA thing would be a one-shot deal.
This way, the only union involved would be the glazers. Have some compassion for the paint!