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Awesome post, let's keep a sticky on this one lol. I've been playing with and using 222 bloom strength hide glue from a furniture maker, seems to gel pretty quick but gives about 5 minutes of work time depending on how thin you mix it. I'm about to make a batch and add 10 percent fish glue (from stewmac) and see how the set time changes. I'm considering using a mix of the two for gluing a horn belly but I am nervous about either straight hide glue gelling too fast on me, or a mixture of hide/fish being too flexible for the cured joint.
Those glue cubes look really clean! Any updates on projects/tests you've used them with?