polyurethane

I am on here just to question how safe it is to use polyurethane around reptiles and arachnids. The step father has decided to install a loft hatch in my room, and although I do pay rent apparently I have no say whether he is allowed to do this. Is it going to be safe for my animals to be...

so i'd like to make a more natural enclosure for my leopard geckos, so i got some cork tile from wickes BUT i've just noticed they are bloody well pre-coated with polyurethane varnish - is this ok to use in a gecko enclosure? also, what's a safe glueing substance for sticking cork to glass...