To solve the condensation problem try a 5 gal pail full of water and ice cubes. Run a coil into the pail and then through your trap. This will knock most of the water out of the system. Dry air is a must for sandblasters, as you've already found out.
Brian 
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1965 Chevy Short Box Stepside, 230 - 3 speed, 4:11 gears, original paint rust free survivor. Now sporting a 383 SBC and TKO-600
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