It's cold, cold sucks. Cold sucks in general, but cold really sucks for painting. So this is my wifes little bathroom heater drafted into block heater duty. There's nothing wrong with rattle can paint if you can apply it right. It's thin which isn't a problem as long as you can put enough coats on. You can't catalyze it but you can cure it in other ways if it's formulated to do so. This VHT is supposed to be cured in an oven at 200 degrees for an hour.
One thing that you don't want to do though is paint with cold paint, or paint a cold surface, it inhibits curing, adhesion, and pretty much everything that you don't want inhibited. That's why I'm heating everything up.