I have painted Aircraft in cold damp areas and that is the same type of paint.
Two tips that could help the next time.

1) Pre heat the stock to where it is warm to the touch before painting.

2) Make up a drying booth, wire coat hanger, plastic sheet, form it into a tube shape and hang the stock inside. Hair dryer and the hose from the vacuum cleaner, set the dryer on low and let the hose blow warm air in the bottom tube. Duct tape will be needed.

WARNING: Use this only in the garage or outside, any area that is well ventilated. Cycle on 5 minutes and off 10 minutes.