I have a cheap primer gun I bought from Eastwood 10 years ago. The gun has a 1.8 tip I have no problem spraying primer except for high build primer. The tech sheet says use a1.6 to a 2.0 tip. I always run a lot of lacure thinner through the gun when I’m done. I don’t know why but the high build primer will sometimes clogg the small holes in the gun. I always stir it thoroughly and strain it before I put it in the gun . What am I doing wrong .Also is there a better way to clean the gun tip