I absolutely love my Raptor Liner. Its rock hard, very chip and scratch resistant and looks great. If you are used to spraying body schutz you'll be fine. It's been a while but I think I ran the shutz gun at around 45 PSI. The higher the psi, the finer the texture will be.
You mix the stuff in the bottle, 3:1 product to hardener, then up to 10% basecoat for your tint. When you buy the basecoat, make sure you tell the body shop you don't want any binders in the paint, or the finished product will take a long time to fully cure and the color may look cloudy. Because you are spraying white, you may want to call U-Pol and explain your situation. I know you can spray white, but I remember the U-Pol rep telling me that if it's done incorrectly and may look yellowish. I didn't spray white, so I didn't pay much attention to what he was saying. So if I were you, I'd call up U-Pol and run everything past them. They are very helpful.
Also the stuff does not cover as well as they say it does. I used 6 bottles on my 8 foot bed and it's still thin in spots. I probably should have used around 10 bottles. However, the nice thing is that you can apply Raptor Liner directly over itself with very minimal prep, so recoating and touch ups are super easy.