Homeowners want to know if sealing granite and marble is necessary, and if it will prevent any and all stains.
The best answer is perhaps a qualified, “It depends.” Generally speaking darker granites like Black Galaxy and Tan Brown do not need sealing very often, and once per year is usually sufficient. Dark stones are denser than
lighter ones, and any stains are usually nearly invisible or barely perceptible because of the darkness of the stone. In plain terms the lighter the color, the more often you should seal it. White and light-colored granites should be sealed more often. Most recommendations would say every three months.