I'm sure that I am not the first to stumble on this applicator, but for what it is worth....
I just completed filling in the hull plank joints prior on my Wherry. At our recent clinic in Port Townsend, we applied the epoxy mix using baggies with a small cut in one corner, and applied the glue like we were decorating a cake. Although inexpensive and effective, the method left lots to be desired (IMO) in terms of control.
I was putting ketchup on a hamburger the other day and a light went off, so I went down to a local retail store and bought a few plastic condiment applicators, the kind you find in fast food restaurants for mustard and ketchup. I mixed up my expoy this morning and the "ketchup dispenser" worked fantastic. I could lay it in exactly where I wanted it and it looked really great. I gave it a cleaning with white vinegar and could likely reuse it again. Each applicator was about $2.50, and holds lots more than the syringes.