How to Seal Flagstones

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Flagstone walkways and patios can add beauty and points of interest to backyards and public parks. Once installed, flagstones need to be sealed to help protect them from the elements. Although this can be professionally done, it is relatively easy to seal your flagstone patio or walkway yourself. With some preparation and a few supplies, you can seal your flagstones to ensure their lasting beauty for years to come.

Things You'll Need

  • 1 gallon sealer per 200 square feet flagstone surface
  • Painter's tape
  • Paint stick
  • Paintbrush
  • Soft cloth
  • Mask off with your painter's tape any areas that you do not want the sealer to touch. These areas could include any baseboards or concrete barriers.

  • Open your can of sealer and stir it with the paint stick. Brush the stirred sealer liberally and evenly onto your flagstone surface.

  • Allow the sealer to sit on the flagstones for five to 30 minutes, checking it in five-minute increments for proper penetration. As the sealer penetrates into more absorbent areas of the stones, use your paintbrush to brush sealer away from areas that have a thicker layer of sealer due to their less porous surfaces. This will ensure an even layer of sealer.

  • Observe your stones closely, continuing to check the penetration levels every five minutes. As soon as the sealer appears to be evenly penetrated into the stones, wipe away any excess using a soft cloth Allow the sealer-coated flagstones to dry for one hour.

  • Apply a second coat of sealer to your flagstones, following steps two through four. After this second coat of sealer has been applied, do not walk on the flagstone surface for four hours. The sealer will be completely set after one to two days.

Tips & Warnings

  • You may need more or less sealer depending on how porous your flagstone is and the brand of sealer used.
  • As an alternative to using a paintbrush, a paint roller may help speed the application of the sealer to larger surface areas.
  • Clean your tools used for this project with mineral spirits.
  • To make sure your flagstone surface continues to be protected from the elements, reseal it every four to five years.
  • Baneclene.com sells stone sealer that will work for a flagstone surface.
  • Do not allow the sealer to dry on the flagstone surface without first wiping the excess sealer away. This could cause the sealer to dry unevenly.

References

  • Photo Credit holzpflastersteine image by Kira Fuhr from Fotolia.com
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