I don't currently have a spray gun and for several reasons have been planning to get a 4-stage HVLP turbine system. My intention is to paint the next large machine with Sherwin-Williams B66 Pro-Cryl primer and B73 zero VOC waterborne epoxy. Both are "reasonably" viscous paints but the S-W datasheets for these products don't give specific viscosity (ranges). I have first hand experience with brushing the Pro-Cryl, but not the epoxy. The datasheets do have some recommendations for airless sprayers and conventional sprayers, but not HVLP.
Airless: .015-.017 tip at 2000PSI
Conventional: DeVilbiss MBC-501 with tip E and nozzle 704.
Airless: .015-.019 tip at 2000PSI
Conventional: Binks 95 with fluid nozzle 66 and air nozzle 63PB
The HVLP system I am considering offers needles/caps in a wide range of sizes.
0.7mm .028"I'm confident the 1.4mm cap is the smallest I should be considering for this stuff, but I don't know how large to go. 2.3mm has been recommended for "texture paint" which seems too thick, but also for "industrial primer" with, of course, no indication of how thick that is. All three of the 1.4, 1.8 and 2.2mm tips are recommended for "latex", substantially thinned for the 1.4mm tip.
If you can convert from the airless or conventional recommendations into the HVLP world, I'd appreciate the benefit of your experience. I'd also like to know how much two adjacent tip sizes will overlap in the paints/viscosities they will handle.