The Natural Stone Institute recommends sealing natural stone once every 6 to 12 months. Using highly acidic/harsh chemicals or direct heat may deteriorate the original sealer, therefore requiring sealing more often. If water is no longer beading up on the top, it’s time to reseal. Over sealing can lead to a hazy look. Natural quartz, solid surface and plastic laminate do not require sealing. Many recycled materials require sealing every three to six months using a wax sealer.