Duffy has encouraged me to add some pics and results of the wet blaster I just made following his plans, I wanted something a little bigger for larger objects but that can still be dismantled easily for set up and storage, most importantly I wanted it cheap. I have about $425 into it so not too bad. The hopper is made from some 16ga stainless steel sheet, I manged to get the whole hopper out of a 24"x 48" piece, the frame is 3/4" angle iron and the cabinet is some 5/8th plywood I had on hand. 4 cans of Rocker Guard to seal the wood inside and out and the inside is also covered 1mm thick pond liner.
The pump I picked up is and old water circulation pump for a large heating system, it might be completely wrong for the job but won't find out until my outside tap unfreezes. I'm hoping that if the pump is a really high pressure unit that I may not need to add an air line, we'll see, it's easy enough to add it later. The LED lamp is a water proof outdoor unit with 2,400 lumens, $36 for two lamps.