I have one of these cabinets, great toys. Hate to be a party pooper but did you seal all the edges, handholes etc with silicone when you put it together? If not, you will find as your blasting media degrades your gunna get fine dust leaking out from everywhere, particularly when the cabinet is pressurised/ has air running into it. You can reduce this markedly by running a vacuum cleaner and filter arrangement off the porthole on the l/h side of the cabinet. Heaps of stuff on the interwebz on how to do this. Happy bladting!