I've used them a number of years ago. I have not used any since the company changed hands. As I recall, they airbrushed very nicely, dried much faster than Testors enamels, and didn't need a clear coat. I polished with Novus #2. I'm sure if Mr. Guest tells you his clear won't yellow, he's correct. I've always been a fan of enamels and at some point in the future I'll try them again.