I was ready to get this baby back in action as I really like the old Soakers the best. After some online research and intuition I settled on something I thought would work. The crack was just a hairline crack so I decided to use good old E-6000 glue. I let it dry for 24 hours and wrapped the pipe with tape to use the dried glue as a water sealing gasket. I gave it an extra day to dry. I was very eager to test the gun at this point.
That did it! The leak was sealed and it held pressure. Many testing sessions later the old XP 65 is still going strong. Hope this helps anyone working on some of the older blasters. E-6000 dries with a strong bond, is water proof, and has just enough elasticity act as a tension seal. Here's a pic to show the XP65 torn down. The red circle indicates the cracked area. While open, I cleaned and greased all the springs, reinforced some of the other seals, and cleaned and greased the pump.

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P.S. If you glance at my arsenal, he only reason I have a Thunderstorm is that it was very cheap second hand as it needed a simple internal repair. The Saturator... well, I loved Entertech guns as a kid. I'm an old school water warrior who goes way back
