Nov 092016

How to Seal Your Marble Countertop

Posted on November 09, 2016 DIY

Marble countertops have been rising in popularity in recent years.  Marble’s natural pattern and beauty makes for an elegant choice when considering countertop materials for kitchen renovation.  We recently caught up with LTP’s own team member, Lian Liu, to see how she seals and protects her recently installed marble countertop!

To determine whether or not you need to seal (or reseal) your marble countertop, perform this simple water drop test: splash a few drops of water on the marble, then time and observe if the stone darkens where the drops land.

The general rules for marble:

  • If it takes less than a minute for the water spot to turn into a darker shade, your stone has no sealer, and definitely needs to be sealed.
  • If it takes 5 minutes, your sealer might be wearing off, and it would be ideal to apply another coat of sealer.
  • If it takes more than 10 to 15 minutes, your countertop is sealed, and there’s no need to apply more sealer.

How to Seal Your Marble Countertop


  • Brush
  • Marble Sealer*
  • Clean, dry towels
  • Painter’s tape


* Stone sealers are either water-based or solvent based.  We used water-based Dupont StoneTech Bulletproof Sealer.  Always read the directions on the back of the packaging for specific guidelines and cure time, as well as test on a small, inconspicuous area before applying to larger surfaces.

Step 1: Tape off edges so that the sealer does not get on your cabinet or backsplash when applying.


Step 2: Apply generous amount of sealer with brush.  We used a disposable bowl for easy dipping.  If you have a lot of surface to cover, it is best to work in sections.


Step 3: Allow the liquid to penetrate for 15-30 minutes (or sealer manufacturer’s suggested curing time).  Meanwhile, keep going over the applied section with your brush in order to ensure even coverage.


Don’t forget to apply sealer to all edges of your countertop.

IMG_8429You’ll notice that the stone takes on a darker shade where the product is applied.  The color will return to normal when water in the product evaporates.

IMG_8430Step 4: After allotted curing time, use a clean, dry towel to wipe off any excess product.  Let your countertop rest for at least 24 hours before using it.


Countertop has returned to its original shade.


Depending on the porosity of your stone, sealer may be applied every one to three years.  With proper care, you’ll be able to enjoy the beauty of marble for many years to come!

~LTP team

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