I found this recipe...
http://www.katehodgson.net/pmcpaste.html
If you read the paragraph under the pic of the bowl with the spoon on the surface, it says,
" While stirring, add a few drops of wintergreen if desired. Wintergreen retards mould and helps give your paste a fresh smell. It is poisonous, even though it smells like breath mints - so caution should be used if working with young children. One paper maché enthusiast who e-mailed, Patricia suggests a couple of tablespoons of salt and a bit of bleach. Her work has remained mould free for 15 years. "
Do u think that any of those chemicals would be poisones after maybe 36-48 hours?
-Reptilez