I converted an antique English buffet into a bathroom vanity. Applied 4 coats of polyurethane to top and cut hole for wash basin. Top is about 1/2" thick mahogany (I think). The top split about 70% of its entire width, extending across the sink opening along the same grain. My guess is that the calked-in sink prevented the top from "working." Need advice on best way to repair this crack and prevent it from recurring.

-Replace the top with marble or granite.

-My thoughts exactly [or slate for that matter]....