First warm paint in a warm - not hot - bucket of water. I had a can of paint pop out it's bottom in my hand while I was shaking it after leaving it in hot water. Scary.

Then stand at an open door and paint the model, but best to do it with no wind. Then bring it inside and use a hair dryer or heat gun on low setting to quick dry the paint. Don't get it too hot! You want the paint to flash dry and this prevents getting dust stuck in the paint.

I was recently painting in -20 C weather with good results .