Stone Care Answers · 9 of 11
Sealing
The one homeowner job that's actually a homeowner job, and everything people get wrong about it.
12 answers on this page. Tap a question to open it.
How often should I seal my counters?
When the water test fails, not when a date comes up. The trade's rule of thumb is every three to six months for marble and six to twelve for granite and quartzite. Some dense granite never fails the test and never needs it. Quartz is never sealed.
Homeowner
How do I know if my counter needs sealing?
Pour a small puddle of water on the busiest spot. Leave it fifteen to thirty minutes. Wipe. If the stone darkened under the puddle, it's absorbing and needs sealing. If it stayed the same color and the water beaded, it doesn't.
Homeowner
Can I seal my countertops myself?
Yes. The product isn't the hard part; application is. Clean and fully dry surface, sealer applied evenly, allowed to dwell per the label, and every bit of excess wiped off before it dries. Excess that dries is a haze that has to be stripped.
Homeowner
What sealer do pros use on countertops?
Solvent-based impregnating sealers with higher solids content, which penetrate deeper and go longer between applications. We use Tenax Proseal and Proseal Nano. Consumer impregnators like StoneTech BulletProof and Miracle 511 are the same category and work well; the big-box spray sealers are water-based impregnators that hold for months rather than longer. Any of them beats no seal. None of them stop etching.
Should I seal my quartz counters?
Never. Quartz doesn't absorb, so sealer has nowhere to go. It dries on top as a haze that has to be stripped off. If someone sealed your quartz and it's cloudy, that's why.
I sealed my granite and now it's hazy.
Either the excess wasn't wiped off before it dried, or the stone wasn't absorbing and the sealer had nowhere to go. Both leave a film. Light haze sometimes buffs with a fresh coat of sealer and a lot of dry cloth. Heavy haze is stripped.
Homeowner / Pro
The sealer went on streaky.
Uneven application or uneven drying. Streaks are dried excess. Same fix as haze: light streaks buff out with more sealer worked in and fully wiped; set streaks are stripped and the top is resealed properly.
Homeowner / Pro
Will a sealer change the color of my stone?
A regular impregnating sealer won't; it protects and leaves the look alone. A color enhancer is a different product: it seals and deliberately darkens the stone, deepening veining and color, and that change is permanent. Test an enhancer on a hidden spot before you commit, and don't grab one by mistake when you meant to seal.
Are sealers food-safe?
Impregnating sealers cure inside the stone and are food-safe once cured per the manufacturer's sheet. Ventilate during application with solvent-based products, and keep food off the counter until the label's cure time has passed.
How long after sealing before I can use the counter?
Whatever the label says, and it varies by product. Most tops are usable for light contact sooner than they're fully cured. Keep water and spills off it until the cure time has passed, or the seal is compromised before it started.
Homeowner
Does honed marble need sealing?
Yes, more than polished. A honed surface is more open and absorbs faster, so oil stains show up sooner. Seal it, water-test it more often, and remember sealing does nothing for etching on any finish.
Homeowner
Should I seal the granite on my outdoor kitchen?
Yes, and expect to do it more often. Sun, rain, and grease from the grill all work on the seal. Granite itself handles the outdoors fine. Quartz doesn't; it yellows in UV, which is why it isn't out there.
Homeowner
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Sources:
Tenax, StoneTech, and Miracle Sealants technical data sheets; Natural Stone Institute sealing guidance.
Reviewed September 2026. Fact-checked against Natural Stone Institute publications and manufacturer technical data by an independent reviewer. Written by Restore My Counters.
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