I will have to look it up, but I got a brush on "self leveling" paint that is supposed to be hard, yet flexable. I do not know how hard it is, but let me tell you about the self leveling. My frame had been narfed up to beat all. The PO narfed it all over so that body plastic would stick to it. I was really bummed as I wanted a normal looking frame, and did not want to put a ton of work into it. So I primed the frame, and hit it with a little primer spot puddy. I did a little sanding, and decided that I would have to brush on this hard protective paint, then would have to spray with flat black, because I KNEW that the shiny black would look like crap from all the narfs. (the spot puddy was used just for the REALLY big narfs). I painted it on heavy, and much to my surprise, it looked GREAT! No brush marks, and no narfs! It filled in all the little narfs and such, and looked great!
I will look around to see where I got it, (on line), cost was about $25 and is more than enough to do a frame and more.
Tom