Sealing granite and natural stone with penetrating sealers, (also called ipregnators), protects the structure of a natural stone. They protect the stone from within. When sealing natural stone or granite with this type of sealer, it is applied directly to the face of the stone with a soft cloth. It's simple to do and does not require a stone specialist. This type of sealer is recommended for sealing granite.

The sealer will penetrate below the stone's surface without leaving a coating or film on top. The stone below the surface will be protected, however, there is no surface protection. This means calcareous natural stones such as marble, onyx, limestone, and travertine can still etch or dull if acidic products such as orange juice or coke are left on your stone.

To help provide surface protection, a natural vegetable soap cleanser or a cleanser made specifically for natural stone should be used. These cleansers build up a thin film layer between periodic deep cleanings. Natural vegetable soaps and stone cleaners remove dirt and debris from the stone's surface the same as a detergent soap does. They are just milder.

Penetrating sealers are either solvent based or water based.

Solvent based penetrating sealers have a higher durability because they are able to penetrate deeper within the stone. Water based, on the other hand, cannot penetrate any deeper into the stone than it will absorb.

In the denser stones, a water based sealer will not penetrate as deeply and leave the protection just below the surface. This means there is less protection of the stone over longer periods of time.

Stones with a high rate of absorption will take the protective sealers deeper into the stone. A water based penetrating sealer works well with very porous natural stones.

The most common protection materials used in penetrating sealers are silicone, siloxane, and fluoropolymers. These materials are unaffected by outside elements and only damaged by temperature ranges of 900F to 1200F or exposure to strong caustic solutions.

Sealers with silicone, silane, and siloxane work well to repel water born stains. This type of impregnator will repel water based liquids such as coffee and tea.

Fluoropolymers are generally water based sealers and have oil repellent characteristics. They will repel oil based liquids such as grease and cooking oil.

If you are sealing granite or natural stone kitchen counters, look for an oil repellant impregnator. An oil resistant impregnator will only slow the absorption of oil while an oil repellant impregnator will keep the oil from entering the stone.


  • The sealer penetrates into the stone and attaches it's protection to the stone walls within the pore structure. This allows the stone to breathe.
  • Does not alter the color or sheen of the stone.
  • Does not need to be reapplied after each cleaning.
  • The sealer is not on the surface so the coating won't scratch or scuff.
  • A penetrating sealer does not need to be reapplied as often as a topical sealer because there is no surface coating to wear off.


  • Penetrating sealers do not protect the surface of the stone from scratching or etching.

Penetrating natural stone and granite sealers are durable. These sealers require periodic reapplication based on the frequency of your deep cleanings and also, the brand of sealer used. Some manufacturers recommend sealing granite and natural stone yearly, while others recommend every five to ten years. Read the recommendations on your product before applying it.

Marble & Granite Supply of Illinois, INC
6666 W. Howard, Niles, IL 60714
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