As long as you have an adjustable gas pressure regulator, a big LP gas grill makes a pretty good powder coat curing oven. I use two digital electronic thermometers when I'm smoking pulled pork BBQ with a 4 burner gas grill- - - -one for the meat and the other for the smoke chamber, and I can get very precise temps that way with only two burners running and the gas pressure turned down low. Slow-smoking a Boston butt or two takes around 12 hours at 275 degrees.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!