Thanks for the helpful responses guys (and potential gals). I've arranged to use a friend's heated garage and will take the highs out with some 1000 grit and respray in warmer conditions. Lee is always bragging about how well his garage heat works! Funnily enough, I already have a respirator...
Re: Sand and polish or sand and respray my orange peel?
Probably should have mentioned that the paint place recommended a single stage spray from the rattle cans they made up for me rather than a base/clear. So that is just several coats of paint with no clearcoat. The paint does look pretty...
Recently I bought some replacement fenders for my truck which came primered. It's an old truck and I am new to auto body paint so I figured painting them in my 10 degree (50F) garage would work well. Maybe it was the cold (the paint can which I ordered in the proper colour from an auto paint...