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Discussion Starter #301
It does work best at higher pressure, but it continues to work decently even when the compressor is constantly running. I'm sure the compressor is undersized, it's only a 2HP Speedaire I bought last year for the grand sum of $25. I'd love to have a big one that would maintain at least 8 cfm while running air tools, or this sandblaster, but one of those isn't close to being in the budget.
This combo will get the job done, even if it does take a long time.
 

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Done that way more times than I can count. Blast a little and let the compressor catch up.
I have a gas and an electric that will do 7.3 cfm @ 90 psi. ea. Next time I blast I am going to connect the two together and see what happens.
 

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Discussion Starter #303
I always wanted to try ganging a couple of compressors together. At one time this past winter I had 4 of them here, but never did it. If I had bought this blaster then I might well have done that. My biggest issue is water in the air...wish I could figure out how to "dry" the air for low cost. If it wouldn't break the bank, I think a long run of copper tubing with a drop to collect the water might work, but again, it wouldn't be cheap. Then I wonder if a 50' coil of copper tubing submerged in ice water would be better. Amazon has the tubing for less than $70, so that might be doable.
 

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My line climbs 2 feet vertical from the compressor and runs 25 feet to a water separator with drier. I get very little water in the drier even in the summer time.
 

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Discussion Starter #305
I drained mine before I started and got a lot of water out, then drained it again in about 1/2 hour and got a lot of water, then drained it again when I quit, which was about another half hour and got a ton of water again. That's at the compressor of course, but I was getting water out of the blasting gun after just a few minutes both times.
 

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I drained mine before I started and got a lot of water out, then drained it again in about 1/2 hour and got a lot of water, then drained it again when I quit, which was about another half hour and got a ton of water again. That's at the compressor of course, but I was getting water out of the blasting gun after just a few minutes both times.
Boyle's Law at work. The water in humid air will condense, but inside the compressor tank is high pressure, and pressure equals heat, so not as much of the water condenses out of the air in there. The spray gun is where the pressure drops, and a drop in pressure equals a drop in temperature, so it is much cooler inside the spray gun than inside the tank and so more water condenses there than in the tank. That difference in temperature between high and low pressure is why air conditioners and refrigerators work.
 

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Discussion Starter #307
I understand that. However, I think that cooling the air before it gets to the gun should cause moisture to drop out and be trapped, right?
 
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