Join Date: Nov 1999
Location: Central California, USA
I use glass beads. I tried sand when I first built it, it bounces back on the glass pitting it.
There is a green stuff copperslag? can't remember. It's more aggressive.
A tip on blasting, there is an ideal pressure where you will have the most suction on the gun.
Try different pressures, use a vaccum gage on the suction line to find it. Or test with your finger on the suction line, you can feel where it works best.
If you go too high on pressure, the suction goes away.
Size the orfice to the cfm you have.
I first ran mine on a sears 2 hp. It couldn't keep up. I've got a 10 hp compressor now.
Realize that with a 5 hp you are going to work your compressor hard on a big job, give it a rest on a hot day!
I've heard running a compressor too hot can break the reed valves and they bounce around inside the compressor doing damage. ( I bought a compresor with disc valves for that reason)
I shure as hell worked the S*#@t! out of that poor old Sears compressor! I even added a copper coil of tubing out of the discharge to tank fitting to add some cooling, cause the tank and hoses were getting hot. I was running a DA sander hours on end. I aimed a portable fan at it too.