/diy/ - Do It Yourself

Might be a dumb question, but how do I "fireproof" my prints? I want to order something made out of Shapeway's sandstone material to use as a candle enclosure but i don't want to spend the money only to find out the airflow prevents it from burning properly. Is there something I can apply to my prints that would at least *temporarily* give it fire resistance, i.e. for a minute or two to make sure the flame doesn't go out?