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Edit: the issue with heating it fast is you force water to condense on the iron.. so it needs to warm up gradually an stay warm until you spray...




That said, if you're planning on using a "propane" heater you need to be warned that propane exhaust is carbon dioxide and water - lots of water - that, in an enclosed space will result in humidity and condensation on anything cold - like a car, and engine block, windows, walls, parts, etc.. You might consider running a dehumidifier while running the heater.

As for the carbon dioxide, open the door for about 5 minutes before you paint. The air will cool down but all the objects will retain and radiate heat.

Good luck (I'd wait for spring!!)