Join Date: Sep 2006
Location: western canada
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If you are sealing a raw edge on your panels I would thicken the epoxy some with colloidal silica (cabosil) help it fill the grain, and to give it some more tensile strength to resist cracking as the end grain swells , which it will even though encapsulated. There is almost always a way for atmospheric moisture to gain entrance to the interior of the wood such as screw holes for hinges and latches etc. or finish damage from sharp objects etc. If you have a finished edge with solid wood nosing or such it is still a good idea to thicken the epoxy a little bit for strength, though not so much you lose clarity and muddy up the grain.
Either way I can't imagine that you will get more than 1/16" build up on the edges, so if you allow 3/16" all around and don't achieve a 1/16 build up you will still have less than 3/16" gap which is not objectionable to the eye, and let's face it, the more the better for utility.
Benthoscritter ir right, if you do up a test piece using the procedure you intend to use you will know for sure. Perhaps you can set that up for whenever you have some epoxy mixed up for other tasks so as not have to mix three tiny batches as a test.