What is the relationship between paint booth air velocity and paint gun pressure?

What is the relationship between paint booth air velocity and paint gun pressure?

Is there a rule of thumb or formula to determine or calculate spray booth air supply velocity w.r.t. the amount of paint required for a particular part?

Paint booth air velocity and paint gun pressure are independent of each other. Paint companies want 80 to 120 feet per minute of air velocity in a spray booth for their coatings to lay down and dry properly. Too much or too little airflow will have negative effects on the paint. Paint gun pressure recommendations vary greatly, depending on the type of coating being applied and the type of paint gun (i.e. help, rp, pressure pot, suction feed, etc.). The best place to find this information is the technical data sheet from the paint company — always start there first.