I just got one of those spot sandblasters, like this:
http://www.toolking.com/grip/view.asp?id=4487
and it works pretty well. I'm using a 3.5 hp compressor and it seems not to overwork it CFM and pressurewise. Left a nice clean surface using slag media with just enough roughness to apply some rust preventative prep. Lots better than grinding and filling.
It doesn't recover the media worth a darn, but there's little blowback to your face if you keep it tight to the work surface. It's not any louder than a spray gun and doesn't make a dust cloud. Well worth the $20.
|