Thanks for the info. I wish I could show y'all a picture of it. I can't even find anything like it online, other than chalky gel coat or clear coat on cars, neither of those are what I'm seeing. It's a light film that "looks like" a thin layer of clear coat flaking. I now know it's not but it flakes like it. There does not seem to have any damage to the wall itself. Where the coating has come off it is a darker color than the area not effected. I found some gel coat at Montana Paints but it only comes in white. I'm more concerned about stopping it from growing then looks but being where it is I would like to have a close match. Again stopping it is more important.