For sandblasting I use an old TIP pressure blaster fed by a 12-hp, 25 SCFM compressor. I have always been pretty happy with this setup because it will blast parts about as fast as you would want to blast them. I use regular sand for my abrasive media; I blast outdoors; and I do not re-use the sand. (Of course I am careful to use breathing protection.) Here's my question: First, I know you can't use a cabinet blaster to clean parts with layers of dirt and grease because you are re-using your abrasive media and the grease will contaminate it. But when you are not re-using your media, is there any reason not to blast dirty & greasy parts? Thanks for your opinion.