Is there any particular reason why you decided to remove the stock trigger valve? Ball valves are very slow to open.
On another note, hot glue should never be used under pressure. It will tear itself apart, and probably take something with it. At the very least, I suggest that you use epoxy.
Also, could you provide some more information on the blaster itself? It appears to be a water gun of some sort, which would explain the large tank, small pump, cap, and the large number of pumps required to build pressure in the tank.
Thanks for the advice. Would plumbers goop work? Ya like jaybo said, it was a water gun that you could strap to your wrist. I took off the front nozzle and it wouldn't hold air anymore for some reason, so I just slapped on a ball valve.