What is marble sealing? The limits of a sealer

Marble sealing is a protective treatment that, when a suitable product is chosen, aims to reduce how far liquids penetrate the stone. It is not a general guarantee that makes the stone resistant to every stain, scratch or chemical attack. Whether it is needed, and which product to use, is assessed together with the stone, its finish, the area of use and the manufacturer's instructions.

First find out what is on your surface

Before a new application, ask whether the stone already has a sealer or some other treatment. If the previous product is unknown, tell the applicator. Rather than layering different products on the same surface at random, ask for a compatibility assessment. The file should record the product name, the date of application and who applied it. That way the next maintenance decision is not based on guesswork.

Describe the effect you expect clearly

Write down which problem you expect the sealer to reduce: water, oil or soiling from a particular use? Check whether the product's technical data sheet covers that scope. The name “marble sealer” is not enough on its own. The area of use, any expected change to the surface and compatibility with the care products should be discussed separately.

Do not confuse an impregnator with a surface coating

Products designed to penetrate the stone and systems that form a separate layer on the surface are not assessed in the same way. Expectations of appearance, use and care can differ. The Natural Stone Institute describes the impregnators used in the stone industry as products that act as repellents; they should not be read as full protection against every kind of attack. Source: NSI care guide (opens in a new tab).

Read a small test area correctly

If the manufacturer recommends it and the applicator considers it suitable, a trial on a representative sample can show any change in appearance. The product instructions should explain when the result is to be assessed. Do not take the look immediately after application as the finished result. Nor does a trial mean the product will perform reliably under every condition of use.

Do not tie reapplication to a fixed calendar

There is no single reapplication interval that applies to every stone and every use. Consider the product instructions, the intensity of use, the current surface and the applicator's assessment together. Rather than having the treatment done on the strength of a general recommendation such as “once a year”, ask for the maintenance information for the system used. Compatibility with the previous product should also be checked when reapplying.

Ask Mabella about the care approach recommended for the material, and get the application and reapplication instructions for the chosen sealer in writing from its supplier. Consider the sealing treatment without letting it stand in for correct cleaning and good habits of use.