Frequently Asked Questions

39 results found

31. We are thinking about installing a dynamic floor heating, which means that the floor covering is directly placed on the circuit, without intermediate screed. Is it possible with Mortex?

For this type of floor heating, no project has been made in Mortex yet. If this type of heating accepts thin screeds, the application of Mortex might be considered. Trials need to be done!

32. On which surfaces can I apply Mortex?

Mineral-based surfaces such as screed, cementing, concrete, etched tiles, lightweight panels (type LuxElement, Wedi, Jackoboard…), plasterboards (not recommended in showers)… and wooden supports: medium (MDF), (not bakelized) plywood WBP,… Tests on glass and metal have also been successfully completed. The support must be healthy, stable, non-greasy and non-powdery. The junctions between the various panels and/or materials must be consolidated.

33. MX08 – How do I remove stains from a MORTEX® varnish coating?

If there are stains on a MORTEX® varnish coating, they are most probably due to the penetration of dirt through openings in the varnish (scratches, impacts) or to a deficient application of varnish that does not comply with the application protocol of the technical data sheet.

To repair and attempt to clean these stains, there is, a priori, no other solution than to sand the surface with a diamond tool to remove the varnish.

In fact, before the sanding operation, one could try to clean the stains by means of capillary action thanks to the application of several layers of absorbent paper (see in this FAQ the capillary cleaning technique).

If this work proves to be inefficient, it will be necessary to sand the part of the MORTEX® coating until the stain completely disappears, in order to apply a new MORTEX® coating, smoothing perfectly the surface of the coating, so as not to repeat the same problem.  The MORTEX COLOR F2 coating can, in some cases, make smoothing easier.

After the MORTEX® coating has dried (see technical data sheet available on, apply the varnish according to the technical installation instructions.

Attention: if you are in a waterproofing technique for a shower, you will have to reapply the missing parts to the system of the two coats of MORTEX COLOR 2N coating.

(see What are the different MORTEX® systems)


Key words: mortex, stains, varnish, damage, scratches, sanding

34. If Mortex is applied on a floor heating, what is the maximum temperature that it can reach?

As with a conventional underfloor heating: 28-29 °C.

35. Who manufactures Mortex?

Beal is the only manufacturer of the Mortex product range and has registered the name. We advise you to beware of imitations and counterfeits as they do not meet the same quality requirements.

36. MX09 – What type of flexible expansion seal can be used between MORTEX® coatings or between the MORTEX® coatings and another material?

A flexible perimeter seal (e.g. between walls and floors, floors and joinery, etc.), type MS polymer (suitable for natural stone and glass) is recommended to compensate for movement due to the expansion of the material. The use of a seal base is recommended.

These flexible seals do not leave any marks on the MORTEX® coating or on other materials, unlike a conventional seals.  MS Polymer offers the advantage of being watertight. This type of seal is used for joints likely to experience movement (expansion, etc.).

The flexible seal must be applied before oil protection.

It is best to stop the MORTEX coating 3 mm from the shower tray with a stop angle and then fill the gap with an MS Polymer seal.

Follow the installation operation carefully. Use a seal base if necessary.

A MS Polymer seal must also be applied around the water inlets (no special round stop profiles are available for this application).

The flexible seal must be checked and replaced if necessary.


Key words: seal, joint, expansion, MS Polymer

37. Is Mortex compatible with underfloor heating?

Yes, with a traditional heating, i.e. with a screed above it. Regarding the application, the heating should be turned off four days before the application and put back into service (by steps of 2 to 3 °C every 48 hours above the support temperature) once the Mortex is completely dry (minimum 7 days).

38. What is the lifetime of Mortex once applied?

Projects done with Mortex 20 years ago still give satisfaction today. However, this does not constitute a warranty. It all depends on the application quality, the use made of it and its maintenance.

39. MX10 – Can a new layer of MORTEX® coating be applied over an old layer of MORTEX® coating?

In any case, cleaning is necessary to make the surface sound and clean.
It is imperative to completely remove the protection present on the MORTEX® coating if there is one.
For protection products with impregnation, the material must be sanded down to the penetration depth of the protection.
The application of RESIDUR primer is not mandatory, but will facilitate the installation of the new MORTEX® coating layer.

The technical data sheet of each product must be strictly observed during application.

Key words: Mortex, new layer, repair

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