8mm cap will be a fine texture i would go with 10mm or 12mm cap water setting is around 150 .. what ever you do dont put your spray hose on till you have the right consistency of material coming through your rotor and stator .. once your happy with that connect your hose put the gun end in a bucket of water and check for air bubbles it will take a while for your product to come through the hose as your down to 8 ltr per min ... once its through turn your air on adjust your air nozzel in the gun till you get the spray pattern your happy with ..remember keep your gun about a foot away from the wall and circulate your gun and never start your gun on the wall or turn off your gun on the wall always in to a tub ...... job done:rolleyes):rolleyes):rolleyes)