S.C. ain't too bad as far as getting Too Cold...we do get in the mid lower 20's and touch high teens every now and then....but I live in Upstate...Lower State toward the coast stays a few degrees warmer
but to answer your question..I have turned wrenches in the 30 degree range....I saw no rush/need to be out there any Colder...Plus I use a kerosene jet heater when I do this.
Believe it or not I have Wet sanded a 69 truck Bed in mid/low 30's..I just kept my sand paper in a 5 gallon Bucket of Hot water...
But to be Flat Honest I DO NOT get after it like I use to...I love cars and Fast cars all the better.. I just don't have the Bug to get to the track as bad as I use to
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "