I have just finished spraying the removable components of my RV-7's interior with the water-based JetFlex. So far I am happy with it but there are some tricks to the process. I first cleaned the parts with PPG's wax and grease remover and then roughed up with a purple ScotchBrite pad. Then cleaned again with the wax and grease remover. On test pieces I have applied JetFlex without a primer with excellent adhesion but that seemed out of my comfort zone so I primed with NAPA 7220. I desired a smooth satin finish so I thinned the Jetflex exactly as stated with 20% distilled water. The tech sheets say that this is designed to spray at high viscosity so I bought a new Sharpe Finex 3000 gun with a 1.5mm tip and a small 250cc cup (don't use the in-cup filter.. it will clog with the think JetFlex). This works great but I think you do need a gun with a tip size for thick material. BTW, I used the HVLP process with 25 psi at the gun which equates to 10 psi at the tip.
Two wet coats worked good. It dries in about 10 minutes but it takes a couple days for the JetFlex to flow out and harden. It is initially cleaned with water but it sets up fast and MEK seems best for cleanup. They say 4-6 weeks to complete hardening.