• Blackfriar Exterior Water Seal

Blackfriar Exterior Water Seal


Stop moisture, water and damp penetrating your exterior walls. Use it on all properties, including old buildings and renovated cottages, and on most surfaces, except limestone and wood.

VAT excluded

£35.63 Tax incl.


Blackfriar Exterior Water Seal stops moisture, water and damp penetrating your exterior walls. Blackfriar Exterior Water Seal is silicone-based, providing excellent waterproofing protection. You can use it on all properties, including old buildings and renovated cottages, and on most surfaces, except limestone and wood. It’s especially ideal for exposed and porous walls that take the worst of the weather.

Features & Benefits

  • Provides a long lasting waterproof seal
  • Silicone-based
  • Ideal for exposed and porous walls
  • Colourless
  • Exterior use

It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.

Product Details

Data sheet

2-4m² per litre
Touch Dry
12 Hours

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

questions Steve Muzyka on 19/01/2019

Can I paint this on a rendered wall of my bungalow.And then paint the wall after. I live near the coast. The bungalow is solid wall construction with no cavity.


No you couldn’t use it in this manner, it is designed to go onto bare masonry and be left as a clear sealer. Any of the Zinsser Masonry coatings would provide a waterproof/breathable finish to the rendered wall, i.e. Zinsser AllWeather Exterior Masonry Paint (Solvent Based) or Zinsser AllCoat Exterior Matt (Water Based) for example.

questions Jeff rees on 19/12/2017
Question: Do you need to use a primer first

No, this should be applied to suitably prepared bare surfaces such as brickwork, cement and mortar.

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