Lee, I have to respectfully disagree. I can only speak for PPG high end clearcoat. I have never used Omni, nor have I used Dupont clear. Using the DC2021 Clearcoat, I reduce 200%. It flows out very nicely, and doesn't sag unless you get heavy handed, then any of them will run. I figured this out one day while talking to Bob Violett about all the work involved in getting a really nice finish on a jet. I had been wet sanding the entire airplane through 2500 grit, then buffing and finally hand rubbing every square inch of the plane to get a really good finish. BV told me he never sands or buffs his planes. I was surprised, because his stuff really looks good. He recommended that I reduce the clear 150-200%. My jaw dropped. Previously I had been reducing 10 to 15%, and could not get rid of the orange peel without sanding. I couldn't imagine reducing 150% or more. At first I tried 150%, then 200%. The 200% did the trick. The clear flows out beautifully with no orange peel at all. You are also able to put on a much lighter clearcoat with the reduced clear. It doesn't take nearly as much clear as it did before. I use the Walcom STM with the 1.0 and 1.2 tip. This is a great gun that paints like an airbrush up to a 4 inch fan.

This is what works for me.

Dennis Lott