CEMENT sink will not crack

CEMENT sink will not crack is the way of using polyester resin for finishing the cement sink bowl to make it stronger and more durable, smooth in the long term, the cement mold was not cracked, it was proven during the 20 day drying period, no cracks were found at all, not even hair cracks. how to coat media with polyester resin and a catalyst for beginners that is simple and easy. may be useful