I would have thought you'd need a self levelling resin rather than varnish. God only knows how many coats of varnish you'd have to put on top of chipboard before you had something you could flat back.
@dallas started
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I would have thought you'd need a self levelling resin rather than varnish. God only knows how many coats of varnish you'd have to put on top of chipboard before you had something you could flat back.