This stuff appears to be a surgical grade acrylic polymer cured with ethyl acetate. The biggest hazard (which may be De minimis) would come from ingestion or inhalation of uncured ethyl acetate and/or un-evaporated carrier solvents such as acetone and dimethyl ether. Absorption through the skin or sub-dermal tissue should be extremely limited. Thus it makes an excellent topical treatment. The toxicity should be fairly low for saxophone reed applications as long as the material is allowed to completely cure before using the reed.
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