We use a 2.5 tip for 2k primer and a 3.0 for polyester (Feather Fill). Runs are WAY better than dry spray which has poor adhesion. Used to use our gun cleaning machine but the air motor went out and solvent is pricey so now we just trash can the Harbor Freight primer guns and lay out another thirty bucks for a replacement. Our finish guns are expensive; Iwata and Sata.


Evan