Either rent a propane heater or get a larger Kero-Sun and let the garage and vehicle heat up for 24 hours before painting. When ready to paint remove the portable heater and maintain your source heat. The temp of the garage can vary by a few degrees but you want the metal temperature to be maintained. You should have no problem then. I have painted many in the wintertime with the garage hovering around 70 with no problems.
Kevin
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