I had the same problem. I went to the supermarket, Walgreen's, Wallyworld, and finally a dollar store, but no Duco, I ended up getting a tube of similar stuff from Wally world, and dollar store. So I have two tubes, it works like Ducco. I was using super glue, and it ran, and then tried the gel, it was better, but still made a mess, so I had to strip the arrow, a couple of times, refinish the arrow, and cut new fletching, and this time used the dollar store stuff, and it worked great. I was making two arrows for a Friend of mine who's boss had prostate cancer, so I made two arrows, this one with triple fletch, and one with Mullet's help a Cherokee two fletch. Eddie gave me a couple of artifacts, he had found, and an arrowhead, he had found in one of the rivers here, and an arrowhead he had made out of Washington jasper or something like that. Same stuff Ishi used.
Anywho, Ducco is just plain hard to find!
I was trying to find a Hobby store, but the one here is gone.
But anywho, the Dollar store stuff, and Wallyworld stuff works just as well.
Wayne