Spray painting is an area I know little about, but I will tell you what I do know or have come to understand.
First, you really should phone up some architectural firms or some paint stores that cater to professional painters. What seems to be a bit of a problem with spray painting new drywall or the mud joints between sheets of drywall is that the force of the spray gun simply doesn't push the liquid paint into those porous surfaces the way brushing and rolling do, and the result is poorer paint adhesion to the surfaces. Basically, the sprayer blows the paint onto the surface of the paper or mud, but there is nothing to force that liquid paint INTO the surface for intimate contact with it, and you need that latter bit to get as good adhesion of the paint as you would with brushing or rolling.
So, now to an increasing extent spray painting contract tenders will specify something called "back rolling". That's where one guy sprays the paint on, and his helper continuously rolls the freshly spray painted surface with an ordinary paint roller to push the paint into the porous surface being painted.
So, if you're keen on having your home spray painted, then spend some time talking to knowledgeable people about whether "back rolling" is needed. As I say, spray painting is a subject I have very little knowledge of, so there may be things that I'm not considering that would determine whether or not back rolling is entirely necessary.
