Sand gun woes

["William C.W. Lamb" <chip@wmsbrg.com>]

So I get myself a nice smallish blasting cabinet, seal up the rest of the
leak spots, and set to work. An hour later, the gun begins to malfunction,
squeeze the trigger a hair, and it works, any further and air is cut off
again. My hand is killing me, so what's going on with the valve, and how to
fix? Did I just get debris in it?

Cheers-

William "Chip" Lamb
West of Sweden SAAB
Charles City, VA.
http://www.wmsbrg.com/sweden/