I give polyurethane foam at least 3 days before I mess with it. If it's particularly thick, it cold take 1-2 weeks to fully cure down to the core. You should be alright to carve it after about 3 days though.
Thanks for the tip John! Too bad it'll take so long...but oh well, sacrifices must be made for the good of my frog community!
I'll go at it in three days...hopefully by then I won't strike a pipeline and be oozed. XD;
0.0.2 Litoria caerulea
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"The gallows are no place for the stubborn//Just you and your lover as a dark souvenir" - Bad Books, Pytor