Heat gun won;t really cure the paint. Running the motor to operating temp for 30 min or so will. The carbs however never get hot. You need the 30-45 steady heat to get the paint cured on the carbs and an oven is best. Depending on the paint, in the house can be ok. I have used one brand, might have been VHT that claims no toxic off gases and low odor and it was true, I could have used the kitchen oven with no worries.