You say you had it laying around .. how long? If it has been sitting for a couple of years, it will have vented the majority of its nasties anyway, but the Polycrylic should finish it off..
Chip board does have UF glue, so it does offgas, but not as bad as particle type wood like MDF.
Like I have said Jeff, there is certainly no guarantee that the offgassing will harm the snakes (and others), but there is enough proof that it affects US, so I don't want to take a chance with MY kids.
Of course, I could just be full of it .. but hey, I'm having fun so ... now just how do you write down that tongue noise?