By: preston On: September 18, 2015 In: Preston Library Comments: 0

When to Seal Your Granite Countertop

Because it has a certain level of porosity, Granite must be sealed to eliminate absorption of liquids. Your granite countertop was sealed by Preston Woodworking when it was installed. As a rule of thumb, you should be prepared to seal it again no more than once per year. To know if your countertop needs sealing, perform this simple test: put several drops of water on your countertop’s surface. Time how long it takes the water to be absorbed. If absorption time is under three to four minutes, your countertop probably needs to be sealed. If absorption time is longer, it probably does not need sealing.

You can also leave two drops of water on your granite countertop for about 30 minutes, and then wipe the water off. If your granite is sufficiently sealed, it will not spot. If it spots, you need to seal it.

How to Seal Your Granite Countertop

  1. Use a penetrating sealer. These are oil-based and are absorbed deep and fast. You can find various brands of granite sealer at most hardware stores; Preston Woodworking stocks granite sealer at our showroom.
  1. Gently apply the sealer into your countertop using a soft rag. You may also use a soft brush. Work in sections of about four to five square feet so you can apply the sealer more evenly.
  1. Wait about three to four minutes until the sealer is absorbed.
  1. Do a second coating when your sealer is almost dry. Use less than what you applied earlier and rub it in gently using a soft, clean rag.
  1. Repeat the same procedure on all sections of your countertop until you have sealed it entirely.
  1. Wait about two hours then repeat the process from the beginning. The time it will take for the sealer to be absorbed will depend on its brand.

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