Both Great Stuff and Silcones have volitile fumes that can be irritating or harmful when applying them. However, the MSDS doesn't list any safety precautions for the cured products. The GE silicones that contain BioSeal to prevent molds has been somewhat controversial among dart keepers, since it is a proprietary formula is not listed on the tube. Although we've been using this for years without apparent problems related to it, since new labeling has revealed the presence of BioSeal, (which was always there, we just didn't know it,) some hobbyists are now worried about possible long term effects. Some of the DAP silcone caulks have FDA approval and should be completely safe.

Great Stuff is stable after it cures and should be no more toxic than Styrofoam at normal temperatures. One would not want to burn any of these, however. I've used it underwater in an aquarium section of a paludarium, and the fish have shown no ill effects after several months. For the past couple of years it has been widely used by dart hobbyists, especially for building backgrounds and as a filler.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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