Sealants for marble plaster and mineral surfaces

The right protection for different applications

Depending on the area of application, marble renders and mineral surfaces may require additional protection against water, dirt or mechanical wear. Our sealants and water-repellent treatments are tailored to different requirements and help to preserve the surface’s characteristic appearance for as long as possible.

From water-repellent protection to hard-wearing sealants, you’ll find the right solution here for wall and floor surfaces, as well as areas subject to heavier wear.

How to properly protect and seal marble render

Marble renders are characterised by their natural mineral appearance and distinctive surface finish. However, in areas that come into regular contact with water, grease, dirt or heavy wear and tear, additional surface protection may be required.

The most suitable treatment depends on the surface in question and its intended future use. The options range from water-repellent treatment, which reduces water absorption, through to protective impregnation with stone oil to a durable 2C PU sealant.

Which surface protection for which application?

Not every sealant or impregnation serves the same purpose. The decisive factor is the stresses to which the finished surface will be exposed.

2K PU sealant
The 2K PU sealant is recommended for surfaces subject to heavier wear and tear and in particular need of protection. A typical application is, for example, the wall behind the hob, where marble render needs to be reliably protected against grease splashes and dirt. Depending on the desired finish, the finished surface can be glossy or matt.

Stone Oil
On floor surfaces, Stone Oil has proven its worth as a protective impregnation. It penetrates the surface and makes subsequent care and cleaning easier. This makes it particularly suitable for mineral floor surfaces where the natural appearance is to be preserved.

Hydrophob Extra
Hydrophob Extra is the right choice for marble render in shower cubicles and bathrooms as well as for suitable outdoor surfaces. The water-repellent treatment reduces the water absorption of the mineral surface without creating a traditional film-forming coating.

Application of the 2K PU sealant

Before application, the paint and hardener must be thoroughly mixed together in a suitable container for at least three minutes. The material is then poured through a paint strainer into a paint tray and stirred thoroughly once more.

A short-pile microfibre roller is suitable for ensuring an even application. The sealant is applied evenly in a criss-cross pattern to minimise visible roller marks as far as possible. Using a paint tray or a skim coat grid facilitates controlled and even application of the material. For a particularly even finish, the surface can be rolled over again with a separate dry roller.

As a general rule, two coats of the 2K-PU gloss sealant are applied. If the finished surface is to remain glossy, these two coats form the final finish. For a matt finish, an additional coat of 2K PU matt sealant is then applied. A matt finish is less delicate and easier to maintain than a glossy finish.

Important note: A suitable silicone joint must be applied at the junctions between the wall and the worktop, or between the wall and the floor. This prevents water from penetrating or rising between the sealant and the lime coating. For this, we recommend using a suitable natural stone silicone.

Application of stone oil

Stir the stone oil thoroughly before use. The substrate must be dry and free from dust and grease. If necessary, the surface can first be sanded with a grit size of approximately 240 to 400 and then thoroughly vacuumed.

The stone oil is applied evenly using a velour roller, a sponge or a brush. The application rate is approximately 80–100 g/m². Any excess material must not be left on the surface. If necessary, remove the excess with a separate dry roller.

We recommend two coats with an intermediate drying time of approximately 24 hours.

During application, the stone oil may be heated to a maximum of 60 °C. This accelerates drying and increases the depth of penetration.

Application of Hydrophob Extra

Hydrophob Extra is applied to the dry, absorbent and untreated marble plaster surface. It is essential to dilute the concentrate with water in a ratio of 1:9 beforehand.

The product can be applied using a spray bottle and then spread evenly with a brush or sponge. Streaks and excess product should be carefully blended in.

After a drying time of approximately 12 hours, a second coat should be applied.

Sealing, impregnation or water-repellent treatment – which is the right choice?

These three protective systems fulfil different functions. Whilst Hydrophob Extra primarily reduces water absorption by mineral surfaces, stone oil impregnetion penetrates the surface and protects suitable floor surfaces in particular. The 2C-PU sealant, on the other hand, provides a more durable surface protection for areas subject to higher levels of wear and tear.

The choice therefore always depends on the marble render used, the substrate, the intended application and the future wear and tear on the surface.

You will find detailed information on application, coverage and application methods on the respective product pages. If you have specific requirements or are unsure about the most suitable protection system, we will be happy to advise you on your choice.

Mineral surfaces, personalised advice and products made in-house – we provide you with materials and support all under one roof.

Any questions about your project?

We’d be happy to advise you on your choice.