Stone sealants can be one of the most misunderstood parts of caring for natural stone. Some homeowners swear by them, others skip them entirely, and most are unsure of their actual purpose. Here’s a clear, no-nonsense breakdown to help you make informed decisions.
What Stone Sealants Actually Do
Stone sealants are designed to reduce the porosity of natural stone, making it more resistant to liquids, dirt, and staining agents. They don’t sit on the surface like varnish; most modern sealants penetrate below the surface to create a protective barrier. This helps prevent stains, slows down moisture absorption and makes everyday maintenance much easier.
What They Don’t Do
A sealant will not:
- Make the stone completely stain-proof
- Prevent scratches or etching
- Change the structural integrity of the stone
- Replace regular cleaning and care
Marble tiles, for example, will still etch from acids even when sealed. Likewise, sealants won’t stop physical damage like chips from heavy impacts.
Types of Sealants: What Works Best
- Penetrating/Impregnating Sealants: These are the most effective and widely recommended. They soak into the stone, protect from within and don’t alter the appearance. Ideal for marble, limestone tiles, granite and travertine.
- Topical Sealants: These form a layer on the surface and can add a sheen. They work on some stones but are less durable, can create a “plastic” look and often require more frequent reapplication.
- Enhancing Sealants: These deepen colour to give a richer, darker look while also offering protection, popular for slate and textured stones.
Do You Always Need a Sealant?
Not necessarily. Dense stones like high-quality granites may not benefit much. But for softer, more porous stone, marble, limestone, sandstone and travertine, a sealant is usually essential, especially in kitchens and bathrooms.
The Bottom Line
Sealants work, but only within their limits. They protect against stains and moisture, but they’re not magic shields. Pairing the right sealant with good cleaning habits will keep your stone looking its best long-term.
