Give me your recommendation for a conversion spray gun that will be used primarily for waterborne finishes. I have a 60-gallon 5hp compressor that is rated at 18.1 CFM @ 90 psi. I would also like to use the 3M PPS cup system with it. I am spraying woodworking projects from furniture to woodturning projects. I have used a gun with the capability of adding air pressure to the cup and like that feature. Is there a system like that which will work with the 3M PPS system?