to invest in the best quality spray gun.
how expensive can it be? are you willing to put a big amount or looking for a budget-friendly paint prayer?
what size do you want your paint sprayer to be? the surface you want to should be taken into consideration. if the area is small, then a small tool will do just fine, whereas covering a large area calls for a bigger gun.
do you expect it to be lightweight?
what kind of paint products to you plan to spray? oil-based products or water-based products?
do you have any idea of the kind of needle you need?
do you need a wide or narrow fan pattern?
as more and 