At this time of year i'd be tempted to rent some workshop space and booth time at a local body shop, you would be surprised how many will help you out. A lot will just charge you for the sundries you use, tape, paper, sanding pads etc
Plus their painter will no doubt be in to lend advise if needed. Probably cost less than buying a compressor and the electric bill to run the heat lamps, which are less than ideal for this kinda of work in winter.