How to Seal a Stone Porch

A stone porch is both beauty and strength: it adds warmth to the home's facade and can withstand moisture and extreme temperatures. To make the porch more striking and add extra protection to it, you have to seal it. Follow the simple steps below to effectively seal a stone porch.

Tools and Materials

  • Mild Dishwashing Cleanser
  • Garden Hose or Power Washer
  • Acetone Stripper
  • Scouring Pad
  • Natural Stone Cleanser (pH 7.0)
  • Distilled Water
  • Cotton Mop
  • Mask
  • Gloves
  • Natural Stone Sealer (Transparent)
  • Paintbrush or Roller Brush

Step 1 – Clean the Surface

Vacuum or sweep the floor to remove dust and other debris. Next, cleanse the surface. Natural stones, whether it is granite, limestone, slate or marble, have a highly porous surface. They stain or discolor when they are applied with cleanser that has a high alkaline or acid content. So when cleansing, use a mild dishwashing soap or detergent. To cleanse: mix the soap or detergent with tap water, dip the cotton mop or sponge, and then wipe the stone porch’s surface to remove dirt, oil and grime.

Rinse the surface using a garden hose or a power washer. Focus rinsing on areas that have collected thick dirt, such as the steps and the corners. Wipe areas with dry cloth, specifically in areas where water is pooling. Allow to dry thoroughly.

Step 2 – Strip and Neutralize

If the stone porch has been sealed previously, it is necessary to use acetone stripper to remove old sealer on the surface. A stone sealer usually fails when it is applied on an improperly prepped surface.

Put on gloves and mask. Even if the area is outside and well ventilated, an electric fan would prove to be useful in helping remove chemical vapors from the stripper (and the stone sealer later on). Get the paintbrush and apply acetone stripper on the surface. Allow to sit for 5 minutes. Use a scouring pad to remove the old sealer and remaining dirt and some stains on the stone’s surface.

Next, apply the natural stone cleanser to neutralize the pH level of the stones. Follow the manufacturer’s instructions on how to use it. Usually, the liquid cleanser is diluted to certain parts of water. Use a sponge to wipe the natural cleanser on the stone’s surface. Rinse the cleanser using distilled water. Let the surface dry thoroughly.

Step 3 – Apply the Sealer

Put on mask and gloves again. Get the fan again, too. These will serve as your protection from the harsh fumes that the stone sealer will emit during application.

Next, get the paintbrush or the roller brush. Refrain from using spray-on sealer even although it offers easier application. Spray-on sealer scatters the liquid sealer quickly and in large areas. This also means that the fumes will disperse quickly, too.

Apply a thin coat and allow to it to dry for 4 hours. Apply the second coat, with a thicker coat this time, and allow it to dry for another 4 hours. If you would like to add more sealer, you can still apply a third coat. Let the sealer dry.