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Which Stones require treatment?

Stone Masters has significant experience in working with both natural and composite quartz surfaces. It is essential to combine manufacturers recommendations with this solid experience to know which stone needs what kind of treatment.

Note, if it was up to the quartz stone manufacturers or the chemical companies, every stone apart from their own should require chemical sealing due to inferiority of product! This is obviously not true – a view driven by vested interests.

This guide will help breakdown truth from fiction.

What is chemical sealing?

When a stone surface requires sealing, we apply specially formulated chemicals designed to bond with the stone, and make it largely impervious to liquids. Note that these are not chemicals you can purchase in a DIY shop, but have to be purchased from specialist stone chemical manufacturers or resellers like Stone Masters.

We recommend that once a stone is sealed, this process is repeated at least once a year to keep the beneficial effects of chemical sealing.

We sell a care kit which contains chemicals to clean your worktops, as well as seal them as described above.

Quartz Surfaces

Most quartz stones explicitly do not require chemical sealing – a big marketing pitch for them. This claim generally applies to the polished surfaces of their ranges. Most quartz brands also offer honed or textured finishes, both of which certainly require sealing.

Some of the quartz brands offer their own sealant chemicals which they insist upon in their fabrication manuals; an example of this is the Silestone Leather Plus chemical which is designed specifically for the Silestone Leather finish range. We apply this chemical to any Silestone leather slabs in our factory before they are cut.


As other stones have come to rival the traditional popularity of granite for work surfaces, many claims have been made that granite always requires sealing. We at Stone Masters would like to contest that view.

As a general rule of thumb, light coloured granites are quite often softer and more susceptible to water ingress. Stones such as the ever popular Kashmir White certainly require sealing. More solid granites like Black Granite or Nero Impala are more resistant to staining due to their structure.

So, sealing in granites is often on a stone by stone basis based on experience. It is not the case that it is better to always seal the stone just in case. Sealing the stone often changes its colour, which can be needless for many granites.

Honed or textured granites always require sealing as a rule of thumb, much like these type of finished quartz surfaces.


Marble is often best sealed where it is going to be constantly attacked by water. This specifically means shower walls and other bathroom areas (marble should be avoided in the kitchen anyway), as opposed to bathroom vanity tops.

Generally, the purpose of sealing is less to stop the ingress of water than to stop the stone from discolouring over time by taking on stains. So, as a bathroom vanity top, it is likely that water splashes onto the marble on a semi-regular basis, however it is simply water as opposed to red wine, or turmeric, or any other vicious staining substance more regularly found in a kitchen.

So, consider the functional use of marble before requesting sealing, which may change marbles colour and add expense.


Stone Masters recommends the use of limestone away from water use. Try not to use it in kitchens or bathrooms. It can be sealed, however, if you do wish to use it in these areas. As with marble, consider its functional use before requesting sealing.

Other stones

Please contact Stone Masters to discuss the sealing of stones not mentioned in this guide.

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