On Monday, February 15, 2016 at 10:30:50 PM UTC-5, wrote:
Is there any reason that PPG concept can't be sanded dry? I need to knock down some bad orange peel (because I'm still learning how to paint). I was thinking about using some 500 to knock down most of the orange peel, and then move to finer grits (wet) take out the sanding scratches before polishing. It seems like everyone is sanding wet, but why? It's much harder to see what you've done because everything gets covered with white goo. If I sand dry, I can blow the dust away and see what I've got immediately. I do know about guide coat and all of that, but I'm wondering what can go wrong if I make the first pass with 500 dry, and then switch to a finer grit wet?

Thanks,

John

Your health would be one. During dry sanding isocyanates will be released, regardless how old the paint is. The newer the paint the more isocyanates will be released. You risk developing asthma, not really good for pilots . PPG Concept is a great paint but it requires proper precautions.