No thats not necessary at all. But if I buy a paint gun for $350 its only going to be used for base and clear. When spraying primer the quality of the spray gun doesn't matter as much. Most paint techs have a few guns.

thanks for the offer fugi but how would I borrow them? I'm in Houston. Besides, as much as I'll be spraying when I graduate I'll want my own set. So I could probably find these "zip walls" at a building supply place? Home Depot would probably look at me like I was crazy if I asked for zip walls.