My buddy installed a new tile floor in his bathroom - Mannington Perugia porcelian tile. It's a very hard surface porcelain tile. Home Depot book on laying tile states porcelain tiles needs to be coated with a penetrating sealer before applying grout. He called the mfgr, Manninton, but did not get a direct answer. The Mannington website did not have any information on applying grout. Should he apply sealer to the tiles before applying grout? Should I post this message to another newsgroup?
Thanks,
Mike