Granite sealer works by protecting the stone surface, primarily through two different methods depending on the type of sealer used: forming a protective layer or penetrating into the stone's pores.
Granite is a porous natural stone, meaning it has tiny holes and channels that can absorb liquids. Sealing is essential to prevent stains from liquids like oil, wine, or other substances from penetrating the stone and causing permanent discoloration.
Types of Granite Sealers and How They Work
The effectiveness and longevity of a granite sealer depend heavily on its composition and how it interacts with the stone. Based on their mechanism, sealers are generally categorized into two main types:
1. Coating Sealers
- Mechanism: These sealers operate by creating a physical barrier on top of the granite surface.
- How it works: They form a thin, protective film or layer over the stone. This layer acts as a shield against spills and stains, preventing them from reaching the stone's pores.
- Protection: Provides a surface barrier against spills.
2. Penetrating Sealers
- Mechanism: Unlike coating sealers, these sealers are designed to be absorbed into the pores of the stone.
- How it works: Penetrating sealers contain molecules that travel down into the stone's pores and bond with the stone's structure. The reference states they form flexible molecular links within the pores. This effectively fills or lines the pores, making it difficult for liquids to penetrate.
- Protection: Offers protection within the stone itself, rather than just on the surface.
- Benefits (according to the reference): Penetrating sealers, such as Stone Care International's Granite & Stone Sealer, tend to last longer and provide more thorough protection compared to coating sealers.
Comparing Sealer Types
Understanding the difference helps in choosing the right product for your granite.
| Feature | Coating Sealers | Penetrating Sealers |
|---|---|---|
| Mechanism | Forms a layer on top of the surface | Goes into the pores |
| Action | Creates a surface film | Forms flexible molecular links within pores |
| Durability | Generally less durable (implied) | Tend to last longer (according to reference) |
| Protection Level | Surface barrier only | Provide more thorough protection (per reference) |
In summary, granite sealers function by either creating a barrier on the surface (coating sealers) or by penetrating into the pores and forming internal links that block absorption (penetrating sealers), with the latter typically offering more durable and thorough protection.
