Quartz Worktops FAQ · Maintenance
Does quartz need sealing?
Short answer: no, never. Quartz is engineered as a non-porous material from day one. Sealing it is unnecessary, can leave a sticky residue and may void the manufacturer warranty. Here is why quartz is permanently sealed by its own structure and the difference compared to granite which genuinely does need sealing.
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Quartz worktops do not need sealing. Ever. The slab arrives at your home already structurally non-porous. The 7% polymer resin that holds the 93% natural quartz crystals together also fills the spaces between the crystals, leaving no microscopic gaps for liquids to penetrate. Industry testing puts the absorption rate at around 0.02 to 0.05 percent which is effectively zero. There is nothing for a sealant to seal.
This is one of the biggest practical advantages quartz has over granite. Granite is a natural stone with genuine porosity, which is why it needs re-sealing every one to two years to maintain its hygiene profile. Quartz starts non-porous and stays non-porous for the full lifespan of the slab. Marketing claims sometimes blur the line between the two materials, and we occasionally meet customers who have been sold quartz sealants they did not need. This page sets out exactly why quartz needs no sealing and what to do if a sealant has already been applied to your worktop.
The most common quartz “maintenance” mistake we see is sealing a slab that did not need it. The sealant becomes the problem the slab never had.
— Rock & Co Showroom Team
What makes quartz non-porous from day one
Three structural features built into every quartz slab combine to deliver permanent non-porosity without any added sealant.
The resin matrix is the seal
The polymer resin used in quartz manufacture is itself non-porous. As the slab is pressed and cured, the resin fills every gap between the crystals and bonds them into a continuous solid mass. The resulting material has no microscopic voids for liquids, bacteria or stains to penetrate. The seal is engineered into the slab rather than applied on top.
This structure delivers three benefits at once. Liquids cannot soak in. Stains cannot set deep. Bacteria cannot harbour in pores that do not exist. Granite, marble and limestone all have varying degrees of natural porosity which is why they need topical sealants. Quartz has no porosity to begin with so a sealant has nothing to do and may actively cause problems.
Resin matrix
No microscopic voids
Permanent structure
No topical needed
Four scenarios where homeowners think quartz needs sealing
Real situations where the question of sealing comes up. In each one, the honest answer is no.
“I sealed my granite, do I do the same for quartz?”
No. Granite is naturally porous and needs sealing every 1-2 years. Quartz is engineered non-porous and never needs sealing. Same showroom, completely different products.
“My new quartz looks dull, would sealing fix it?”
Almost never. Dullness on new quartz is usually residue from cleaning products or hard water spots. A proper deep clean restores the shine. Sealant would make it worse by adding another residue layer.
“I had a stain, will sealing prevent the next one?”
No. Stains on quartz are surface-level and clean off with the right method. Sealant cannot prevent stains on a non-porous surface and may actually trap stain residue beneath the sealant layer.
“My installer sold me a sealant kit, should I use it?”
No, and ask why they sold it. Reputable quartz installers do not sell sealants because they know the slab does not need them. Decline politely and stick to soapy water for daily cleaning.
The maintenance cost saving vs granite over time
Three escalating tiers showing the cost of not sealing across different timeframes. Quartz delivers the headline saving by needing none of this.
- No sealant purchase
- No application time
- No waiting for cure
- No quality variation
- Five to ten sealing rounds saved
- Hours of weekend time saved
- No risk of poor application
- Same hygiene profile as day 1
- 15-25 years of maintenance saved
- Significant time saving
- No worry about missed cycles
- Lifetime hygiene consistency
Across the lifespan of a typical UK quartz worktop, the maintenance cost saving versus granite is several hundred pounds plus dozens of hours of time.
If a salesperson, fitter or kitchen retailer tells you quartz needs sealing, treat it as a red flag. Either they have confused quartz with granite or they are selling unnecessary products. The major UK quartz brands all explicitly confirm no sealing is required.
Sealing requirements across worktop materials
A side-by-side view of how the most common UK worktop materials differ on sealing needs and porosity.
| Quartz | Granite | Marble | Solid wood | |
|---|---|---|---|---|
| Sealing needed | Never | Yes 1-2 yrly | Yes 6-12 monthly | Re-oil monthly |
| Porosity at install | Non-porous | Porous | Highly porous | Highly porous |
| Porosity over time | Non-porous | Drops as seal ages | Drops as seal ages | Constant attention |
| Annual seal cost | £0 | £25-50 | £30-60 | £15-30 |
| Time per seal cycle | 0 hrs | 2-3 hrs | 2-3 hrs | 1 hr |
| Risk of poor application | N/A | Streaks possible | Patches possible | Uneven possible |
| Hygiene if seal forgotten | Excellent | Drops | Drops | Drops |
7 steps to handle quartz that has been sealed by mistake
If you or a previous owner has applied sealant to a quartz worktop, here is how to handle the situation cleanly. The sealant can usually be removed without lasting damage.
Identify the symptoms first
Sealed quartz often feels slightly tacky or sticky to touch. Looks slightly hazier than a clean polish. Attracts more fingerprints than expected. Catches dust unusually quickly. These are all signs of sealant residue on top of a non-porous surface.
Stop applying any further sealant
The first step is preventing the problem getting worse. Set aside any sealant kit you were using and switch to soapy water cleaning only. The slab does not need it and never did.
Try gentle removal first
Warm soapy water and a soft microfibre cloth removes light sealant residue if applied recently. Rinse thoroughly and dry. Repeat if needed. Many cases resolve at this stage.
Use a dedicated quartz cleaner for stubborn residue
Quartz-specific cleaning sprays from brands like Granite Gold or Method are formulated to lift residue without damaging the polish. Apply, leave for the recommended dwell time, wipe clean and dry.
Avoid abrasives entirely
Do not reach for scouring pads, steel wool or harsh degreasers. These will scratch the polished surface beneath the sealant and create more problems than they solve. Stick to soft cloths.
Call a professional for thick or aged residue
If the sealant has built up over years or is thick enough that gentle removal does not shift it, professional refinishing can restore the surface. Same firms that polish quartz can usually handle sealant removal.
Switch to a soapy water routine going forward
Once the sealant is removed, the slab returns to its original non-porous performance. Daily cleaning with mild soapy water and a microfibre cloth is all the maintenance the worktop needs from here on.
Side-by-side timeline of maintenance needs
Five timeline stages comparing the maintenance needs of quartz versus granite. The contrast over a 20-year period is significant.
Day one performance
Quartz: non-porous, ready to use. Granite: arrives sealed at install. Both perform well at this stage.
First granite re-seal
Granite needs first re-seal cycle. 2-3 hours plus £25-50 in product. Quartz needs nothing. The maintenance gap begins.
Multiple granite cycles
Granite has had 2-3 re-seal cycles. Owner has invested several hours and around £100. Quartz still needs only soapy water.
Cumulative gap
Granite owner has done 5-7 re-seal cycles. Spent around £250-400 and 15+ hours. Quartz owner has done none. The cost of “low maintenance” quartz is now very visible.
Lifetime saving
Granite total: 12-15 cycles, £500-1000 plus 30+ hours. Quartz total: zero of either. The non-porous structure has paid back in time and money.
Three sealing-related mistakes UK homeowners make
From years of customer questions about sealing, these are the three most common ways the question gets the wrong answer in UK kitchens.
Buying a “quartz sealant” kit
Some retailers sell “quartz sealant” products. These are usually granite or stone sealants rebranded for quartz. Quartz does not need them. Application leaves a tacky residue that attracts more dirt rather than less.
Trying to “re-seal” after a stain
A stain on quartz means the surface needs a clean, not a seal. Sealing on top of an unaddressed stain may trap the stain permanently. Always clean the stain first, never seal as a fix.
Using granite sealant by mistake
Granite sealants contain oils designed to penetrate the porous stone. On non-porous quartz the oil sits on top creating a sticky film that attracts fingerprints and dust badly. Removal can require professional refinishing.
Looking for more quartz worktop answers?
This article is part of our complete quartz worktops FAQ. Sixty-plus quick answers to the questions UK homeowners ask us most often, all written from the showroom floor by a team that has fitted quartz for over twenty years.
Where to go from here
For the structural reason why no sealing is needed in the first place, our piece on is quartz porous covers the science behind the non-porous structure that makes sealants unnecessary.
For the broader maintenance picture that quartz delivers without any sealing at all, our article on how to maintain quartz worktops walks through the genuinely simple care routine.
And for understanding how the no-sealing benefit translates to long-term hygiene compared to materials that do need sealing, our piece on are quartz worktops hygienic covers the food-safety case that the non-porous structure underpins.
For the wider context of all our maintenance and care answers, the full quartz worktops FAQ covers every question we are asked across the showroom and on the phone.
Quick answers
Is quartz really maintenance-free?
For sealing yes. For everyday cleaning, you still need to wipe down with soapy water and dry to keep the polish looking its best. The “maintenance-free” claim refers specifically to no sealing, no specialist treatments and no annual upkeep beyond normal cleaning.
What happens if I seal quartz anyway?
The sealant cannot soak in because the surface is non-porous. It sits on top creating a tacky film that attracts fingerprints, dust and dirt. The slab looks worse rather than better. Removal requires either thorough cleaning or professional refinishing.
Will my quartz warranty still cover me if I sealed it?
It depends on the brand and circumstances. Some manufacturers void the warranty if non-approved products have been applied to the surface. Worth checking your warranty terms before applying any sealant. Stick to soapy water for daily cleaning to keep warranty cover intact.
How can I tell if my worktop is quartz or granite?
Quartz has very consistent patterns across the slab. Granite has natural variation, sometimes with darker spots, mineral inclusions and visible grain lines. Quartz feels slightly warmer to the touch than granite. Your installation paperwork should confirm which you have.
Is there ever any reason to apply a product to quartz?
For shine refresh, a sparing spray of standard window cleaner buffed dry with a microfibre cloth restores the polish. That is not sealing, just cleaning. Beyond that, quartz needs nothing applied to its surface other than mild soapy water for daily cleaning.
Want a worktop that needs nothing beyond soapy water?
Pop into our Stevenage showroom or give us a call. We will explain exactly what your slab needs and what it does not, plus quote you for a worktop that genuinely delivers a sealing-free lifespan.