How to Seal a Tile Countertop

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A tile countertop is a cost effective and durable countertop option for kitchens and bathrooms. Since a tile counter has multiple grout joints and is constructed of potentially porous tiles, you should seal it against staining on a regular basis. If the tiles are nonporous, seal the grout joints on their own, and wipe the excess sealer off the tiles. If the tiles are made of stone, polished porcelain or crazed ceramic seal them as well as grout them.

Things You'll Need

  • Cleaning supplies
  • Impregnating sealer
  • Foam paintbrush
  • Lint-free cloth
  • Clean the tile countertop well. Remove any dust, debris, wax, grease or other substances that may keep the sealer from penetrating into the tiles. If the tiles are porous, use a stone cleaner or mild detergent to avoid marking the tiles. Many tile counter cleaners are available in spray bottles; spray the cleanser on the tiles and use a clean sponge to wipe them.

  • Allow the counter time to air dry completely.

  • Paint the grout joints and any porous tiles with impregnating sealer using a foam paintbrush. Use a silicone-based sealer for better protection. A water-based sealer could break down very quickly in a countertop setting. Fully cover the area with the saturated brush, and take care not to leave any dry spots.

  • Apply the sealer from the back toward the front to maximize coverage, pulling it toward you with the paintbrush. Depending on the porosity of the tiles, the sealer could spread a great deal.

  • Continue to push the sealer over the tiles with the paintbrush until you cover all areas.

  • Allow the sealer to penetrate the grout joints and any porous tiles for one hour.

  • Wipe up any excess sealer from the grout joints and porous tiles after one hour with a clean, lint-free cloth.

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