FWIW I made the mistake of trying out Brodak's White Primer once, shooting a good solid coat on an All American. I've never used nitrate on anything, I've never felt a need for it. In my case the primer was sprayed directly over their butyrate clear. It didn't crack up or anything like your above photo but I did find it EXTREMELY hard to sand and also VERY heavy. Because of the difficulty in trying to sand it off I eventually gave up and ended up leaving about 98% of that coat on the model which added a ton of weight. I promptly threw the remainder in the trash to make sure I'd never be tempted to try it on something else. I've always had excellent and consistent results with all other Brodak (Randolph) dopes but I'll never use that primer again.