Sherwin Williams ultra 7 base clear is in my opinion top notch from my experience. My dad owned a body shop, I painted, and a good friend of mine was a Sherwin Williams and Ditzler trained painter, rep, and automotive paint store manager. You do not need a lot of air pressure as long as you use a hvlp gun. It only requires 20-25 psi to atomize the paint. if you use a siphon feed gun you will need about 40-60 psi, depending on the gun and viscosity of the paint. The hvlp is better for many reasons, mainly they use less material because they waste less and as a result, give a cleaner, better finish because they use less air to atomize the paint because the paint is gravity fed. You need clean, dry air. Use gravity to help and a in line filter. The best tip I can give if you have never sprayed base clear is: when applying the base coat, do not try to "paint" it, just get even colorfast coverage and an even "matt finish". The shiny finish comes from the clear coat. I learned to paint with acrylic enamel and that was the hardest lesson I had to learn when I started with base/clear. Also pay attention to the paint manufacturers fluid tip size requirements as well as temperature, humidity, and reducer requirements. One very nice feature of base/clear is that you can rework, repair it within a few hours of applying it if needed and it is relatively easy to repair and blend it if needed. And truth be told, most painters do need to do this more often that they like to admit.
