Sand-blasting cabinets?

I bought one from Harbor freight and the dang thing sprayed sand everywhere the first time I used it. Apparently the sealer they used to seal the corners didn't hold very well. It was underneath so I didn't notice it was falling off when I set it up. So I had to unload all the sand and flip it over and reseal it with RTV. And clean up a huge mess of glass beads that it sprayed out the back and bottom, UGH!! Since I sealed it it's ok. I don't use it alot so I didn't buy a vacuum but it really needs one if you use it for over 5-10 minutes. May have to look into a cheap shop vac.