RAKU Nanocoating vs. Traditional Sealer
| Feature | RAKU Nanocoating | Traditional Sealer |
|---|---|---|
| Application Method | Trained professional, single visit | Self-applied or pro-applied, needs repeat visits |
| Etch Protection | May reduce risk; follow care guidance | No |
| Stain Protection | May reduce absorption; follow care guidance | Partial |
| Visual Change | None | None |
| Durability | Long-term | 1-3 years |
| Reapplication Needed | Follow product guidance | Yes, regularly |
| Food Contact | Confirm suitability for intended use | Varies |
| Heat Resistance | Follow product guidance; use trivets | Not heat-rated / varies by product |
| Warranty | Confirm current terms | Typically none, or short product guarantee only |
| Cost per sq ft | $65 | N/A (varies by product) |
How a Traditional Sealer Actually Works
A sealer is a topical or penetrating product that fills the microscopic pores in marble, travertine, limestone, onyx, or quartzite. Once it's in place, it slows down how quickly liquids soak in, buying you a window of time to wipe up a spill before it stains. That's the extent of what it does. Sealer doesn't change the chemistry of the stone and it doesn't protect the surface itself, so etching from wine, citrus, or vinegar still happens on contact, because etching is a chemical reaction with the calcium carbonate in the stone, not a staining issue. Sealer also breaks down. Foot traffic, cleaning chemicals, UV exposure, and normal wear erode it steadily, which is why manufacturers recommend reapplying every one to three years. Skip a cycle and the stone is unprotected without any obvious warning sign.
How RAKU Nanocoating Works Differently
RAKU isn't a coating in the way a sealer is a coating. It's a nanoscale treatment designed to react with the mineral structure of the stone, forming a bond across the surface and down into the pores rather than just occupying them. The treatment is intended to reduce exposure to staining and etching, but results depend on the stone, preparation, use, and care. Follow the applicator's guidance for heat, cleaning, food contact, and reapplication. A trained professional should assess coverage and suitability before installation.
Which One Costs Less Over Time
Sealer wins on the first invoice. A single application is typically far cheaper than RAKU's listed price, and that upfront gap is real. But a sealer may require repeat applications, each with its own product and labor cost. RAKU's cost and service interval depend on the project; ask for a current estimate and written care guidance rather than assuming a fixed ownership period or warranty.
If you're weighing a quick sealer touch-up against a nanocoating, the honest answer is that they're not solving the same problem. Sealer buys you time between maintenance visits. RAKU is intended to add surface protection, including against etching, but care and maintenance remain important. Request an estimate for your specific stone and ask for written suitability, care, and coverage details.
Frequently Asked Questions
Is RAKU better than a marble sealer?
RAKU is designed to provide longer-term resistance to etching and staining, while sealer primarily offers partial stain protection. Neither option removes the need to follow appropriate care guidance; ask the applicator about reapplication and maintenance.
How long does RAKU last compared to a sealer?
RAKU is designed as a long-term treatment, but service life and coverage depend on the installation and current manufacturer terms. A traditional sealer typically needs reapplication every one to three years to keep working.
Is RAKU worth the extra upfront cost?
It depends on the stone, use, and installation scope. RAKU may cost more upfront than a single sealer application, while sealer can require repeated applications. Compare current estimates and care requirements for your project rather than assuming a fixed service interval.