Why Traditional Marble Sealers Fail Over Time
Every traditional stone sealer shares the same design limitation: it's a topical or penetrating product that sits in the surface pores of the marble rather than bonding to the stone itself. That's why sealing marble has always been a maintenance task instead of a one-time fix. Water, oil, wine, and acidic foods gradually break down the sealer, UV exposure and heat speed up the breakdown, and normal cleaning wears it thin. Within one to three years, most sealers have degraded enough that the marble is effectively unprotected again, often without any visible warning. Homeowners are told to reseal annually, but in practice resealing gets skipped, and the stone quietly loses its stain protection. A traditional sealer also never fully protects against etching in the first place, the dulling, cloudy marks left by lemon juice, vinegar, or wine. Sealing marble has never solved that problem. It only slowed down staining, and only temporarily.
How RAKU Nanocoating Works Differently
RAKU doesn't behave like a sealer, and it isn't a surface film or laminate either. Instead of resting in the stone's pores waiting to wear away, RAKU's nanoparticles penetrate the pores and bond chemically to the mineral structure of the marble, onyx, quartzite, travertine, or limestone. The result is a continuous, permanent barrier that becomes part of the stone rather than a coating layered on top of it. Because the bond is chemical rather than mechanical, there's nothing sitting on the surface to peel, yellow, or wear thin the way a sealer or a protective film eventually does. RAKU is heat resistant up to 1,900°F, won't crack or peel, and is food-safe once cured, meaning it's approved for direct food-contact surfaces, from countertops to butcher blocks. It's applied in a single day by a Lantania-certified applicator, with no downtime and no need to disconnect faucets or plumbing, and commercial installations carry a 10-year warranty. That single application is meant to be the last time the stone ever needs sealing.
Who This Page Is For
This page is for homeowners and businesses asking the practical question behind every stone sealer search: how do I stop worrying about my marble? That includes kitchen countertops exposed to daily cooking acids and oils, marble and onyx bars where wine and citrus are constant threats, bathroom vanities, and commercial surfaces that can't afford downtime for recoating. If your stone protection strategy currently involves remembering to reseal on a schedule, RAKU removes that schedule entirely. Quartz countertops are a related but different case: quartz is engineered and largely non-porous, so it doesn't require sealing the way natural stone does, though the question comes up often enough that it's worth understanding on its own before deciding whether any treatment is needed.
RAKU vs. Traditional Sealer vs. Protective Film vs. No Treatment
| Feature | RAKU | Traditional Sealer | Protective Film | No Treatment |
|---|---|---|---|---|
| Etch Protection | Yes | No | Yes | No |
| Stain Protection | Yes | Partial | Yes | No |
| Visual Change | None | None | Altered at edges | None (but stone unprotected) |
| Durability | Long-term | 1-3 years | 2-4 years | N/A |
| Risk of Yellowing/Peeling | No | No | Yes | N/A |
| Food Safe | Yes | Varies | Yes | N/A |
| Reapplication Needed | No | Yes, regularly | Yes, every few years | N/A |
| Cost per sq ft | $65 | N/A | $30-45 | $0 |
If you're tired of resealing marble every year and still dealing with etching and stains, it's time to stop treating your stone with a temporary fix. RAKU nanocoating gives marble, onyx, quartzite, travertine, and limestone permanent protection in a single day of work, backed by a warranty and applied only by certified professionals. Request a free estimate from Marble Armour today and find out what permanent marble sealing actually looks like.
Frequently Asked Questions
Do I need to seal marble if I use RAKU?
No. RAKU replaces sealing entirely. Once applied and cured, it creates a permanent bond with the stone, so there's no separate sealer to apply or maintain afterward.
How often does marble need to be resealed?
Traditional sealers typically need reapplication every one to three years. Marble treated with RAKU doesn't need resealing at all, because the nanocoating is permanent.
Can RAKU be applied over an old sealer?
A certified applicator will assess and properly prepare the stone before application, which may include removing residue from a previous sealer so RAKU can bond directly to the marble's mineral structure.
Is RAKU more expensive than sealing?
RAKU costs more upfront per square foot than a single sealer application, but because it's permanent and removes recurring resealing costs, it's a one-time investment rather than an ongoing expense.