Gee, I'd like to be able to shoot a coat of nitrocellulose without ending up with any pinholes. I've learned a lot and I'm getting better and better but I just can't seem to beat this problem completely. Of course it doesn't help that I live in Dallas and am trying to do this in 100 degree tempertatures with 80 percent humidity! Now that the weather is cooling down I want to try it one last time. I am using thinner and thinner mixtures as I get to the final coat, and yes, I am using more and more retarder as I go. The coats are looking really good but when start sanding there they are - tiny little pin holes! Unfortunately, I learned the hard way not to try to sand them all out. I am wondering if the heaviness of my passes has anything to do with the results? I am using a cheap HVLP gun. Does anyone have any suggestions?