Duke Stone of Cornwall design, supply and install premium bespoke stone surfaces including quartz worktops, granite, marble, porcelain and sintered stone for kitchens, bathrooms and luxury interiors across Cornwall. Working with homeowners, developers and designers in Truro, Falmouth, Newquay, Wadebridge, Padstow, Rock, St Austell and surrounding areas, we combine expert craftsmanship with contemporary coastal inspired design.
Does Natural Stone Need Sealing? (And How Often Should You Do It?)
Natural stone is one of the most durable and beautiful surface choices for kitchens, bathrooms and interiors. But one of the most common questions we get at Duke Stone of Cornwall is simple:
“Does natural stone need sealing?”
The short answer is yes – in most cases, natural stone benefits from sealing. But how often, and whether it’s needed at all, depends on the type of stone, where it’s installed, and how it’s used.
What This Guide Covers
Why natural stone needs sealing
Which stones require sealing (and which don’t)
How often to seal stone worktops
Signs your stone needs resealing
Professional vs DIY sealing
How to maintain sealed stone surfaces
Granite and marble sample slabs showcasing natural stone finishes used for bespoke worktops in Cornwall.
Why Does Natural Stone Need Sealing?
Most natural stones are porous, meaning they can absorb liquids if left unprotected. This can lead to:
Staining from food, oils and liquids
Bacteria build-up in unsealed surfaces
Water marks and discolouration
Long-term damage in high-use areas
Sealing creates an invisible barrier that helps prevent absorption while maintaining the natural look of the stone.
At Duke Stone of Cornwall, we always advise on the correct sealing approach based on the specific material and installation.
Which Natural Stones Need Sealing?
Granite
Granite is relatively dense but still benefits from sealing, especially in kitchens.
Polished granite kitchen worktop with waterfall edge, combining durability with natural stone character.
Quartzite
Quartzite is harder than granite but can still be porous and benefits from sealing.
Marble
Marble is more porous and reactive than other stones and requires regular sealing.
Polished marble surface with natural veining, commonly used in high-end interiors.
Limestone
Limestone is highly porous and always requires sealing.
Slate
Slate varies but often benefits from sealing to enhance durability.
DIY sealing can be effective if applied correctly.
Professional Sealing
Correct product selection
Even application
Maximum protection
Longer-lasting results
How to Maintain Sealed Stone Worktops
Clean regularly with pH-neutral cleaners
Avoid harsh chemicals
Wipe spills quickly
Use chopping boards and heat protection
Honed marble bathroom vanity, where sealing is essential due to regular water exposure.
For inspiration on durable, low-maintenance options, explore our Coastal Range Quartz.
One of the reasons quartz has become increasingly popular is that it does not require sealing, unlike most natural stone surfaces. If you are deciding between the two materials, our guide to Granite vs Quartz Worktops: Which is Best for Cornwall Homes? explains the differences in maintenance, durability, appearance and suitability for Cornwall homes.
Request Advice or a Quote
If you’re unsure whether your stone needs sealing, we can help.
