How to Seal a Sandstone Patio

A sandstone patio must be sealed properly, with an appropriate product, to prevent water and bad weather from damaging it. Sandstone is a particularly porous material, so sealing it is very important. A penetrating sealer needs to be used, and applied thoroughly, to both the stones and the grout between them. Ideally, a coat of sealer should be applied to the sandstone tiles before you even lay them on the ground. After that, further coats of sealant will provide much needed protection, and keep your patio looking great for years to come.

Tools and Materials Needed:

  • Penetrating sealer
  • Penetrating grout
  • Sponge
  • Paint brushes

Step 1 – Apply the First Coat of Sealant

The sandstone tiles should not be laid on the patio without having been sealed first. Apply a coat of the sealer before laying the tiles. Follow the manufacturer’s instructions on the product label before beginning. It is important to apply this first coat of sealer, before laying the patio. This makes grouting the joints between the tiles easier.Also, the dyes in the grout mixture will not end up bleeding into the sandstone tiles, making the final result look much better too. Apply the sealer with a brush. These preparations can save you a lot of time and maintenance in the future.

Step 2 – Allow the Sealer to Cure

As before, refer to the manufacturer’s instructions, and determine the recommended drying time. Generally, the tiles should be left for 3 days. This will allow the sealant to cure, as well as dry. The purpose of the penetrating sealer is to soak into the sandstone tiles, making them less porous. This will make the tiles far more resistant to water. Before continuing with the job, the sealer needs to be left for an adequate amount of time to dry and cure, so that it works as intended.

Step 3 – Apply a Second Coat of Grout and Sealer

The second coat of the sealer should be applied after the sandstone tiles have been installed on the patio. This coat of sealer can be applied relatively quickly, and can be done in the same manner as the first coat. However, you can also apply this coat simply by wiping it on with a sponge in the same manner that you would to clean the patio. Apply the sealer over the entire patio, and be sure not to miss any sections.

Step 4 – Leave to Dry and Apply Subsequent Coats

After the second coat, about 3 hours will be long enough to leave it to dry, before giving it the next coat. The more coats of sealant you give the patio tiles, the more durable the stones will be. Apply a third coat, after having left the second on to dry for an afternoon. In total, 3 to 4 coats should be ample. An extra 1 or 2 coats is advisable, only if the patio is likely to get a lot of wear and tear.