I need an inexpensive empty fire extinguisher like what you'd find in a household kitchen. I want to rig it to work as a flamethrower instead of a fire extinguisher. Sort of an ironic gag.
Heat gun. Do not use a razor blade. You will chip the paint no matter how careful you are.
It would be cheaper (no shipping charges) if you go to an auto parts store. The employee behind the counter will certainly know what you mean and find it easily.