Not to ruffle feathers here BUT, if I were painting a car or whatever, I would try to minimize the risk of ruining a paint job by using some cheap filter/drier. I understand $$ availability and I have used the el crapo filter driers when I was learning. However, even I could see back then that I was potentially spraying water drops....I could do a blow gun test and actually see moisture. Like Shine says in post 36, a compressor type dryer is cheap insurance. Last time I bought paint, it was pretty darn costly.... buying the paint again would be even worse. Recently, I have been spraying a lot of high temperature paint and post baking it. I was amazed at how effective grounding the parts were to keep airborne paricles from sticking to the parts.....if you don't have a booth, there is an enormous amount of crud floating in the air!!