Actually I believe my current problem is a chemical incompatablity, The P sheet that Challenger1 posted a link to sez don't use urethane reducer with DXR-80 hardener...Use one from the DTR series.. If your using DU-5 hardener then you can use DT reducer...

I do agree slower reducer flows out better.. In the past I've used plenty of Acrylic enameel with great results.. But it's been off the shelf here in California over ten years.. I can't get the stuff I used in the past & the local paint supply shops have likely forgotten most of what they once knew about the stuff..