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I had another look in Bunnings but the only other coating I found was a clear oil based varnish but that was about $26 for a small tin. I've decided not to bother with any coating for now but I've glued in the bottom parts of the polystyrene inserts and weighed them down with some wood. If they don't stay in place then I'll try some foam spray which will at least firm up the inner box anyway.
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