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While Gorilla glue will expand to fill a void, it is not a structural gap filling glue. The expanded foam does not have much strength. Gorilla's website states that the surfaces to be glued must fit tightly, and they do not claim any gap filling properties. I have read numerous reviews in woodworking magazines, and they are pretty much in agreement on this point. They now make a Gorilla Epoxy (two-part) that they do claim is a structural gap filling glue. However it is a 5 minute setting epoxy, and I'm thinking it won't have as much strength as a slow-set epoxy. I'd stick with the slow-set epoxy method described above, which should work well.