CA is not toxic but is an irritant. One can develop asthma like symptoms after repeated exposure, I have. Filling pores with CA on a guitar requires good ventilation, gloves and goggles, and even then, the fumes are unbearable for some. Epoxy is toxic, and can also be an irritant. Personally I can hardly stand the smell. Poly varnishes use petrochemical solvents, so there's a degree of toxicity there, even if low. If you decide on Steve's suggestion, use gloves. Some floor finishes are very high in solids and could fill pores relatively quickly, but I bet they also shrink considerably, so I would test on scrap and wait at least a couple of weeks. If it works I would sand back to the wood for two reasons: those poly varnishes are not as clear as a good oil varnish, and do not have the degree of elasticity required for a guitar (I asume the poly coat would inevitably crack). Epoxy and CA do not shrink, while an oil based filler shrinks a bit. Finally I think there are a few poly products specifically designed for the purpose.
_________________ Laurent Brondel West Paris, Maine - USA http://www.laurentbrondel.com/
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