SEM is excellent stuff. Several years ago, I personally tested the vinyl black on an old piece of body side molding and left it out in the weather about 5 months or so stuck to wall on the back of the shop. Sun, cold, hot, rain, and whatever else. Held up like a champ. So when I located some gray NOS body side molding for a guy with a black 87 442, he painted the centers with it after trimming and it looked like it was made that way. Came out nice.