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The fire resistant paint I found is quite impressive. If the school media room had been painted with it, the rest of the school would still be there. (firefree.com) A reviewer tried painting one side of a piece of cardboard with it and found a blowtorch took 8 minutes to ignite the cardboard through the paint. It puffs up to form an insulation barrier when the paint reaches 350 degrees. Overkill for me, but I can sleep quite nicely with overkill.

But I appreciate the suggestions. I like to take a while to be sure I've thought through all the options.
 
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