x2 about heat lamps but if you have the right setup/paint and conditions you can still lay down a nice finish, if you do spray down the floor of where you will be painting, wait a full day for it to fully dry before you spray or else the water/humidity will end up on your paint. Also put the car on jackstands and take all 4 wheels off, or some guys run a chain to ground the car. Dont be discouraged if it comes out with orange peel, you can always cut and buff for a nice shine. Check out forums such as hotrodders and layitlow for some good info on painting and making booths.