I need to add this comment - Two things the photos do not show - I used sticks inside the hull cut to length so they push up and act as clamps. Also, the JB weld released from the syringe and that was a good thing because after injecting the first fill, I had to retract the plunger which sucked the epoxy back in to the syringe! The JB Weld acted as a nice seal for when I put the syringe back on the extension to keep it from leaking.
By removing the syringe, I was able to retract the plunger, refill it, then inject some more. I injected in each hull the equivalent of five pumps of West System epoxy.
That's all for now. More photos tomorrow.