I've used Krylon for plastics (spray can) on several outside items. Works great. 3 years ago I spray painted all the shutters on our house. They are a vinyl you know. They were a dingy blue color. I took them all off, repainted with Krylon for plastic a bright red. When painted with the dark dingy blue under it, it actually came out more of an antique (rich color) red, which turned out beautiful and really gave the house that "zing" we wanted. I did 11 windows (22 shutters) some 3 years ago, and all of them still looks great, no pealing, no flaking after 3 weird winters, spring rains, high winds, and lots of corn and bean dust beating against them during harvest season.
Krylon is the way to go.
