I am impatient too tripper , no biggie , just a bit more work . I would do like you already said , I would clean with spirits and thinner , the thing is sometimes you can't get a gun clean , if it is the gun . I'd definitely try on scrap after cleaning , I would try changing up your technique too , try a few light passes before going with a wet coat , give a good amount of time between coats to flash off . Its gonna be tough to find problems between compressor and gun since they are used together . Like I say , hope you find the cause sooner than later .