All natural stones should be sealed prior to and after installation. You should also consider sealing light-colored quartz as well. While most tile does not need to sealed, ceramic tile with crackle finish, and handmade, concrete, and Saltillo tiles should be sealed after installation.
Different materials require sealers that are specific to their needs. One size does not fit all. Our stores sell a wide selection of sealers and our salespeople will be more than happy to direct you to a product that suits your needs.