Lastly, although it resists scratching and is very tough on a large scale, porcelain can be damaged if subjected to a sharp impact by a heavy object. Much like a ceramic mug might chip when dropped, a porcelain countertop can flake when hit directly on the edge. This type of damage, though rare, is essentially non-repairable since glue applied to the underside of the chip will add enough thickness to be felt, and any attempt to grind and re-polish the surface will remove the pattern printed onto it. A chip or flake can be filled in with a UV-cure resin designed for stone, but the repair will probably always be visible. In other words… don’t hang a cast-iron Dutch oven above a porcelain countertop.