Sound familiar ? Of course it does ! In the wild, we build debris shelters and snow caves. We minimize the size of the shelter so we can warm up the shelter with our own body heat. How does insulation work? Heat flows naturally from a warmer to a cooler space.
Satin paint usually takes about 2-4 hours to dry, but if you are recoating, then it will take 8 hours.
There is nothing you can do with a painting that is finished except wait. It should harden in a few days, but it will take about 4 -- 6 months to be truly dry. Store in a dust-free location and wait until then to apply varnish or whatever finish coat you use. Whatever you do, don't use a hair dryer or put it in a slow oven.