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Weber Saint-Gobain - Official website of the company

webersil P

webersil P
webersil P

Product Benefits

  • A high quality mineral paint for new build masonry substrates
  • A low-maintenance finish on to external wall insulation 
  • Rejuvenates existing rendered substrates 

A high performance mineral paint with a low-maintenance finish for external walls

Product Features

About this Product

webersil P is a solvent-free, water-based silcone resin emulsion paint (SREP) for masonry substrates.

Features and Benefits

  • Unique combinatiion of high water repellency, high vapour permeability and low VOC
  • Resistant to blistering and peeling 
  • Highly hydrophobic – water beading effect (see image insert) helps maintain a clean surface
  • Chemically bonds to masonry substrates due to nanoscale molecular structure
  • Resistant to algae and fungi growth
  • Vapour permeability and UV resistance independently tested
  • UV stable and resistant to acid rain ensures exceptional long-term durability and performance
  • Forms part of a number of approved insulation systems

Colours & Finishes

webersil P is available in a wide range of colours. Specifiers should consult the Weber Synthetic Colour Guide for more information.

Final colour selection must be made against an actual sample. Weber will not accept responsibility for colours chosen from any source other than an actual sample.

Order your samples here

Technical Services

weber's Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Technical helpline
Tel: (01525) 722110
Fax: (01525) 718988

Sales Contact

Weber products are distributed throughout the UK through selected stockists and distributors. Please contact the relevant Customer Services Team below for all product orders and enquiries.

England and Wales:-

Tel: 08703 330070

Fax: 01525 718988

Scotland, Northern Ireland, Isle of Man, Republic of Ireland:-

Tel: 028 9335 2999

Fax: 028 9332 3232  


Product Datasheet

Material Safety Datasheet

Send or download the documents

You can either send the documents to an email address, or download it

Preparation & Application


Existing rendered substrates

Hammer test and remove all areas of loose, ‘bossed’ render.

Treat surfaces with weber CL150, a biocidal wash. Refer to data sheet for full instructions.

Wire brush, or wash down surface with a high pressure jet (40 – 80 bar) to remove all traces of growth.

Make good surfaces using weberend stipple and weberend TUC or weberend PUC.

New rendered substrates

Ensure new render is fully cured, clean, dry and free from dust.



To ensure colour consistency, paint required for complete and adjoining panels should be of the same batch number or be thoroughly mixed together before use.

When the surface is dry, apply a first coat of webersil P, diluted 10 – 15% with clean water, using a wool roller.

Apply a second, undiluted coat when the first coat is dry, normally between 6 and 24 hours.

Stable surfaces with particularly high suction should be primed with weber PR310.

To ensure product acceptability, colour samples must be requested. These are freely and readily available from Weber.

Spillages stain and are difficult to remove so:

  • protect vulnerable areas thoroughly
  • wear protective clothing
  • clean tools with water

Good practice

Do not apply:

  • If frost is forecast within 24 hours of use
  • In damp/wet conditions
  • In temperatures below 5°C or above 30°C
  • On elevations in direct sunlight or where the substrate is hot

Where it has been agreed that painting will be carried out as part of a remedial action to harmonise colour on a rendered facade, complete and all adjoining panels must be over coated. The painting of any panels should be carried out at the same time under the same weather conditions.

Exact colour matching of mineral render and paint is not guaranteed. Colour appearance will vary naturally between paint and render as the products are fundamentally different in composition and hence finished appearance.

Packaging, Health & Safety


webersil P is packaged in 12.5kg plastic buckets with batch code and description on the side.

Storage and Shelf Life

Wet pre-mixed materials must be stored frost-free and protected from direct sunlight and extreme heat. To prevent ingress of air, buckets should be stacked no more than 2 high, and where a central support is used, to a maximum height of 4. When stored under these conditions, the shelf life of the product is 12 months from the date of manufacture.

Health and Safety

Essentially non-hazardous.

For further information, please request the Material Safety Data Sheet for this product.