I used to spray these at 10 - 15 PSI, but please understand that's a ballpark figure. You may have to go a touch lower or even bump it up. Every batch of paint is different, everyone's technique is different, everyone's set-up is different, and current conditions in your painting area always plays a role, so start low and test off the model until you hit that pressure which feels right at the moment and gives you the result you want. Just keep testing and adjusting off the model until you're comfortable and only paint it when you're confident all is good.