Monocouche colour consistency

Monocouche renders are made from a formula containing selection of natural aggregates blended ingredients and pigments. weberpral M is manufactured with quality assurance through the use of modern plant and stringent quality testing. All Weber sites operate to BS EN ISO 9001:2000 and BS EN ISO 14001. There are a number of factors that can influence the final cured shade of a mortar mix, however it is the anomalies that site conditions provide that typically can have the greatest impact. It is imperative that material required for complete and adjoining panels or elevations should all be from the same batch product number or be thoroughly dry mixed together before use.
As with any natural formed product, colour shade may alter between batches. 

Consideration should be given to the rendered work so that any panel and those adjacent to it can be completed in a progressive sequence. Delays between finishing dates, may contribute to differences in appearance between the panels. Any changes in application procedure, due to differences in climatic conditions for example, can result in shade variation between rendered bays. Whenever possible the panels should be finished on an external angle. Condition, consistency & moisture content of the supporting substrate will affect the drying and curing of the product. The background needs to be of a reasonable alignment so the render thickness is relatively consistent, the walling should be made up of similar materials that have the same behavioural qualities particularly in relation to suction to provide equal drying of the applied rendering. Best Practice is required to protect backgrounds from saturation and or prolonged dampness, likewise excessively dry, porous or warm masonry prior to render installation. Consistency of the volume ratio of water to product is key within the mixing process.

The time at which the scraping element of the product is carried out is critical to the finished shade. The earlier the material is scraped within the setting process will create a deeper texture and give the appearance of a darker colour shade. Scraping later will give the appearance of a much lighter colour shade. This point of material set should be kept consistent throughout the works, and especially adjacent panels, to avoid colour variation. Colour disparity and consistency is an aesthetic issue and not one that will affect the performance or durability of the render.

Remedial action

If a remedial solution is deemed necessary than an application of webersil P will resolve this problem. webersil P is a high-performance mineral paint that gives exceptional long term durability and performance. It is anticipated that the use of this product will not detract from the low-maintenance benefits of the weberpral monocouche render. Providing that the monocouche render is clean, dry and sound, a direct application of the webersil P is appropriate. The first coat of webersil P should be diluted with between 10% and 15% clean water and the paint then applied with a medium pile wool paint roller. 24 hours later a second coat is applied. This should be applied undiluted. The application should be in a criss-cross pattern ensuring that the paint is applied evenly minimising any effect on the scraped texture of the monocouche.

Contact us

If you have any questions or would like assistance, please contact our technical team:

Our technical team is available Monday to Friday, 8:30am until 5.00pm.

Click Compare to help you choose the right product for your project, if you need further assistance please email