Anybody have a solution for orange peel when painting. Have been having a real hard time painting with acrylic enamel w/o getting orange peel. I've tried all different kinds of paint/thinner rations (from 1:1 to 4:1). Surfaced was prepped and final sanded with 600 wet/dry wet. Finish appears to be very smooth but just can't get away from orange peels. Using an HVLP gun that delivers 10 psi at the tip with 40 psi going in to the gun. Any ideas?