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And, remember that moister in your air is your enemy!
I have found that a simple water trap did not do a good enough job to remove moister from my lines.
I added a MotorGuard air filter.
Whenever you compress air is gets very hot, and then produces water/moister in your air. This moister will play havoc w/ your blasting air.
And, as mentioned by others, you need volume (Cubic feet per minute) and fast recovery, more than you need high high pressure though pressure is part of the equation.
Your air volume needed will be dictated by your air requirements. If you have a small ice chest sized blast box, short runs of hose (the shorter the better on a small cabinet), then your air volume and recovery requirements are not as large as running a huge cabinet.
I've got a 135 cubic feet per minute (CFM) two stage 220v compressor behind a SKAT brand Champion blast cabinet and it does a great job keeping up when I'm running the gun full-time without let up.
Andy,
I use 70 Grit aluminum oxide media when i Duracoat, i pick it up at Harbor Freight. It leaves it pretty ruff so you would want to use some lighter grit or glass bead to finish. I can bring you a peace i've blasted if you want to see what it looks like.
Steve,
I've heard that you want 100 psi for sandblasting. I'm not the expert though.
Anyone, would 40 psi be ok?