The Urethane is less brittle in extreme cold and adheres to the primed metal better than some enamel and epoxy paints. On skis you will find brushing the paint on the bottoms more cost effective since you'll be doing it every year depending on the trail conditions.What i have been using for most of the parts is krylon Epoxy enamel. What is the difference between that and the urethane spray bomb?[/b]