A) Airless Sprayers atomize coatings by forcing the product through a small tip opening at very high fluid pressure. The fluid pressures range from 1200-3600 PSI. Airless sprayers are capable of spraying larger surfaces at higher speeds. Airless sprayers have more overspray than HVLP which is the amount of product that does not adhere to the surface you are spraying.
B) HVLP sprayers are classified as a finishing tool. The pressure from the cup supplies paint to the gun, where a high volume of low pressure air intersects with the paint stream breaking the paint into small particles called atomization. Since the spray pressures are much lower, the atomized paint has less bounce back. This means less overspray and better control