I am doing a similar deal. Is the car off the road for the winter? If not, good luck.

This is actually my 3rd over-winter restoration project. I'm not sure how cold it gets there, but I can work down to 0 degrees F in my garage, which is neither insulated nor heated. I use an electric radiator heater, a Mr Buddy propane heater, and an infrared heater for warmth. The propane heater is turned on when I first wake up and gets turned off when I go out to the garage. The infrared and radiator keep the temp around 50.

Dress in layers. I wear long johns under insulated blue jeans and wear 2 or 3 shirts topped off by a sweatshirt. A hat is a necessity and an old pair of Mickey Mouse boots keep my feet toasty warm.

Depending on what you are painting you are probably going to be better off waiting for warmer weather. If you are painting a small area using a rattle can then you will be ok, but 50 or 60 is the coldest you would want to spray most modern paints.