Marble and granite sealer, anti-graffiti - ProtectGuard MG

Limits the ingress of graffiti, oils, grease, water and weak acids into marble, polished granite and porcelain. Once applied, the concentrated sealer stays colourless, forms no film and is UV resistant - the surface looks just as it did before treatment.

Surface

Natural stone

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Product image: Marble and granite sealer, anti-graffiti - ProtectGuard MGNatural stone

The concentrated version of the MG range, for materials of low and very low porosity: marble, polished granite and porcelain. It protects against water, oils, grease and weak acids, and also against graffiti.

What separates it from the Eco version is concentration and scope: MG is concentrated and also protects against graffiti, while Eco is water-based, solvent-free and, according to the manufacturer, carries food-contact approval.

The product is colourless and forms no film - the material stays permeable to air and water vapour, and the treatment does not yellow with age (manufacturer's data).

Stone forgives less than concrete. An acidic cleaner used on marble or travertine will etch the surface irreversibly, and excess sealer on a polish leaves a smear that can no longer be removed.

  1. Match the cleaner to the stone. Marble, travertine and limestone are sensitive to acids - for those, neutral or alkaline products are the right ones.
  2. Remove waxes, polishes and polymer coatings. A penetrating sealer will not get through a layer of wax.
  3. Dry the stone all the way through and check that no moisture is being drawn up through the joints.
  4. On polished surfaces have a clean, soft cloth ready to lift the excess - you have minutes, not hours.
  5. Ventilate well when working with solvent-based products.

After sealing, polished stone usually stays out of use for 72 hours.

Before sealing the whole area, test on a patch hidden by a planter or in a corner of the patio. The same product can read differently on two batches of the same material, and on a surface with old coating left on it, it will not bond at all.

Coats
1
Finish
invisible
Application method
roller, brush, spray
Dilution
Do not dilute
Where to use
indoors, outdoors
Recommended substrates
materials of low and very low porosity, including polished ones
Final appearance
colourless, no change to the appearance or character of the material
UV resistance
does not yellow over time (manufacturer's statement)
Manufacturer's pack sizes
500 ml, 5 l
Can I use a granite sealer on marble?

Not always. Marble is soft and sensitive to acids, granite is not, so the product has to match the type of stone. Before you buy, check that marble is on the list of recommended substrates.

How do I clean stone once it has been sealed?

With cleaning products of the right pH. For the polished-stone range that is usually pH 5-9 for the invisible versions, and a wider range for the wet-look ones. You will find the range for your product in its technical data.

Will sealing stop the stone yellowing?

It helps, though not in every case. It limits the ingress of water and the compounds dissolved in it, including those that discolour stone from below. It will not stop processes inside the stone itself, or rust from fixings.

Which stones is it for?

Materials of low and very low porosity, including polished ones. For absorbent stone - sandstone, travertine, limestone - the right products are the siloxane sealers applied to saturation.

Will it change the polish of the stone?

No - the product is colourless and does not change the appearance or character of the material. As with any sealer on polished stone, lift the excess before it dries.

How much will you need?

Consumption depends on how absorbent the surface is and how you apply the product.

Write to us with the area and the type of surface - we will help you work out how much you need.

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Prepare the surface first

A sealer will not bond to a dirty surface. Start by cleaning it thoroughly.

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