If you have problems spraying about that , Just soak the nozzle and make sure it is clean.
I have never had to do that ...But all I do is run some ru311 through mine and back flush it once or twice.
laquer thinner always worked for me if you keep up on it right away every once in a while you might have to break it down for a good scrubbing you will know when that is cause your AB will be acting up and frustrating you immensly