With regard to sealing the top and bottom plates, I used to build boats and epoxy is the choice because not only is it strong but gap filling.
By mixing a thickened epoxy you can fill many gaps.
Is there a reason the luthiers seem to avoid epoxy, and use wood glue exclusively?
Thank you Paul. Guitar makers avoid epoxy in some cases, but they definitely use it for others like inlay work and gluing oily woods together.
For the body, most guitar makers frown upon having gaps that need sealing with a product other than wood glue. The idea being that if you are failing to make a good joint, you should just work harder on that joint and get it right rather than relying on a filling product.
I have always taken a more middle of the road approach and I believe that using modern adhesives in a traditional instrument is not a bad thing.
As long as you are making a good joint, and not using the epoxy to overcome a terrible fit, then all you are really doing is using an incredibly strong adhesive in the place of wood glue.
In that sense, you can’t go wrong. For the record I do not use epoxy for the body sealing, but if your plates fit well, you can use either wood glue or epoxy successfully.
Let me know if you have any additional questions, and happy building.
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