[Lew Silverman]

Do you know how many CFM the sand-blaster requires to operate properly? That will give you the best idea when building an air compressor. You usually want a unit that is at least capable of providing 1.5 times the air volume your tool requires and a large enough tank to keep the pump from having to exceed its duty-cycle rating. The two-stage units most often have a higher pressure rating than the single-stage units do, but for tools that use a lot of air (like a sand-blaster) the SCFM ratings are much more important.

I see the pump you are talking about in the new Harbor Freight catalog that arrived this morning, but it doesn't list a SCFM rating. You'll need it to make a decision.

Good Luck!