My garage has a forced air natural gas furnace.
I have a drill press about 15' from, and directly in front of the duct work outlet. I often put spray bombs on top of the drill press to warm up. it I forgot and a can sat there all day, it wouldn't get much higher temp then the surrounding air. That is probably not any higher temp then that spray bomb would see sitting on a shelf in the summer. I don't have a spray booth, painting gets done outside when the temp is between about 50, and 80.