That low porosity explains why quartz skips the sealing conversation entirely. Marble, granite, and other natural stones need periodic sealing precisely because their pores are exposed to the air and to whatever gets spilled on them. Quartz's resin matrix closes that door during manufacturing, so there's no seal to maintain, no pores to fill, and no reapplication schedule to track. This is one reason quartz has become a popular low-maintenance alternative to natural stone in kitchens.
Low porosity is not the same as indestructible, though, and this is where quartz owners sometimes get the wrong idea. Quartz is not etch-proof. The resin binder can be damaged by strong acids, undiluted vinegar, certain drain cleaners, some oven cleaners, left sitting on the surface, leaving a dull spot even though the stone itself resists staining. Quartz is also not heat-proof. Setting a hot pan directly off the stove onto quartz can scorch or discolor the resin, and thermal shock from sudden temperature swings can cause cracking. So while quartz doesn't need sealing, it isn't immune to damage, which is why some quartz owners still look for an added layer of protection, particularly on high-use kitchen islands and bar tops where hot cookware and acidic ingredients are a daily reality.
That's where RAKU nanocoating fits for quartz, not as a sealer, since quartz was never a sealing candidate in the first place, but as an optional protective layer against the specific risks quartz does face. RAKU bonds permanently to the surface rather than sitting on top of it, adding real resistance to acid etching and heat, up to 1,900°F, and an extra margin against staining, all without introducing any kind of maintenance cycle. It's applied in one day by a certified applicator, comes with a 10-year commercial warranty, won't yellow or peel, and is food-safe once cured. For a busy kitchen or bar counter, that means the practical durability of quartz plus a permanent buffer against the acids and heat that can still mark it.
It's worth being direct about the distinction: quartz and marble are different materials with different vulnerabilities, and RAKU isn't solving the same problem on both. On marble, it replaces sealing outright. On quartz, it's an added shield against etching and heat rather than a fix for porosity that isn't there to begin with. If you're comparing surfaces or trying to understand how sealing works on natural stone in the first place, read our full guide to marble sealing for the full breakdown.
Frequently Asked Questions
Can quartz countertops be damaged by acid?
Yes. While quartz resists staining, its resin binder can be etched or dulled by strong acids like undiluted vinegar or harsh oven and drain cleaners if left sitting on the surface too long.
Does quartz need to be resealed every year?
No. Quartz is engineered with a resin binder that closes off its pores during manufacturing, so it doesn't require the periodic resealing natural stones like marble need.
Is RAKU coating good for quartz?
Yes, as an optional protective layer. RAKU adds permanent resistance to acid etching, heat, and staining on quartz surfaces, which is useful in high-use kitchens and bars, even though quartz doesn't need traditional sealing.