Sealing Stone Countertops with Natural Sealers
By Fred Hueston
For Your Clients Sensitive to Chemicals: For clients who are sensitive to chemicals, traditional solvent- or water-based impregnating sealers can be problematic. These sealers often contain volatile organic compounds (VOCs), which can off-gas during application and even afterward. For chemically sensitive individuals, this can cause respiratory irritation, headaches, and other reactions. Fortunately, there are natural alternatives for sealing stone countertops that offer a degree of protection without the harsh side effects.
What Are Natural Sealers?
Natural sealers are derived from food-safe, non-toxic substances and are free from synthetic resins and harsh chemicals. While they don’t offer the same level of stain resistance or longevity as modern impregnating sealers, they are still a viable choice for clients who prioritize health and environmental considerations over maximum performance.
Mineral Oil
Mineral oil is one of the most commonly used natural sealers for stone countertops, particularly for soapstone and honed finishes.
Benefits:
- Food safe and non-toxic.
- Readily available and inexpensive.
- Enhances the color and depth of certain stones (especially soapstone).
- Easy to apply and reapply as needed.
Limitations:
- Provides only minimal stain resistance.
- Needs frequent reapplication (as often as weekly or monthly depending on use).
- Can attract dust or develop a sticky film if overapplied.
Application Tip: Apply a generous amount of mineral oil using a clean cloth, allow it to soak in for 20–30 minutes, then buff off the excess with a dry cloth. Repeat regularly or whenever the stone begins to look dry.
Other Natural Sealing Alternatives
- Beeswax-Based Blends
Some commercially available or DIY blends include beeswax, often mixed with mineral oil or carnauba wax.
Benefits:
- Adds a protective layer and enhances color.
- Creates a semi-hard finish that resists water better than oil alone.
- Still food-safe and non-toxic when properly formulated.
Application Tip: Warm the beeswax slightly (if solid) and rub it into the stone with a cloth. Allow it to set, then buff to a soft sheen.
- Carnauba Wax
Derived from the leaves of the carnauba palm, this wax is harder than beeswax and provides more water resistance.
Benefits:
- Food safe and often used in organic furniture polish and cosmetic products.
- Offers a glossier finish than beeswax.
- Can be used alone or in combination with other oils or waxes.
Limitations:
- Can be more labor-intensive to apply.
- May not be ideal for all stone types due to its glossy finish.
- Walnut or Coconut Oil (Caution Advised)
These oils are sometimes used as a natural option but must be used with care.
Risks:
- They can go rancid over time, especially if not properly refined.
- Nut oils may pose allergy risks.
- Not ideal for porous stones due to potential for deep absorption and spoilage.
If you or your client chooses to use these oils, look for refined, food-grade versions and test in a small area first.
Important Notes for the Professional
- Discuss expectations: Clients must understand that natural sealers offer far less protection than commercial-grade impregnators. Set clear expectations about performance and maintenance.
- Spot testing is crucial: Always test any natural sealer on an inconspicuous area before full application, especially with sensitive or light-colored stones.
- Compatibility with stone types: These natural products are better suited for dense stones like soapstone or honed black granite. They are not recommended for marble, limestone, or other porous stones that may etch or stain easily.
- Kosher Use: While mineral oil as a stone sealer is generally considered kosher by default, strictly observant households might still opt for a certified kosher version for peace of mind in food-prep areas.
Using natural sealers like mineral oil, beeswax, or carnauba wax can be a safe and effective alternative for clients who cannot tolerate traditional chemical sealers. While these options won’t provide the same level of long-term protection, they are easy to maintain and can be part of a sustainable, health-conscious maintenance plan. As a restoration professional, offering these options can expand your service range and help meet the unique needs of chemically sensitive clients.
