Rust-Oleum Mathys Fillcoat Fibres
  • Rust-Oleum Mathys Fillcoat Fibres

Rust-Oleum Mathys Fillcoat Fibres


Rust-Oleum Mathys Fillcoat Fibres is an emergency repair, instantly waterproofing, fibre reinforced coating for flat and pitched roofs to seal leaks and cracks quickly and simply, even in bad weather: 

  • Direct repair of roofs, non-walkable terraces, gutters, ridge-pieces, chimney stacks, pipes, etc.
  • Excellent adhesion directly to bituminous substrates, metal, hard PVC, polyester, glass and more
  • Can be applied in all weather conditions (except for snow)
  • Faster and cheaper than calling the plumber
  • Can be overcoated with Rust-Oleum Mathys Dacfill WaterproofingRust-Oleum Mathys Coating PRT or Rust-Oleum Mathys Dacfill HZ.
  • Repairs holes and cracks up to 2mm and stops leaks instantly!
VAT excluded

£56.48 Tax incl.


Rust-Oleum Mathys Fillcoat Fibres is an instantly waterproof, fibre reinforced repair coating for flat and pitched roofs, non-walkable terraces, gutters, ridge-pieces, chimney stacks, pipes, etc. Fillcoat Fibres seals leaks and cracks up to 2mm wide, quickly and simply, even in bad weather! It is a fibre reinforced water sealant product for immediate waterproofing.

Features & Benefits

Surface Preparation
Remove dust, mud, grease, moss and withered leaves carefully. The spots to be repaired are cleaned with a hard broom and sponged. After cleaning, Rust-Oleum Fillcoat Fibres an be applied directly on bituminous substrates, hard PVC, polyester, zinc, aluminium, glass, tiles, etc. Porous materials (concrete, stone, wood) must first be dried and pre-treated with a coat of Rust-Oleum Mathys Primer 44 HS. In case of repeatedly repaired spots, important or active cracks, apply Rust-Oleum Fillcoat Fibres crosswise over the cracks or fissures. Consumption: 1,5 kg/m² with a hawk or a block brush.

Directions for Use
To ensure homogeneity, coating materials should be thoroughly stirred prior to use.

Application & Thinning

  • Brush: Do not dilute.
  • Roller: Not recommended.
  • Air-atomised spray: Not recommended.
  • Airless spray: Not recommended.
  • Cleanup: Rust-Oleum Thinner 22 or White Spirit.

Application Conditions
Can be applied during all weather conditions, except for snow.


  • Adhesion primer on Rust-Oleum Mathys Dac Hydro Alu.
  • Product is recoatable with Rust-Oleum Mathys Dacfill Waterproofing, Rust-Oleum Mathys Coating PRT or Rust-Oleum Mathys Dac Hydro Alu.
  • Never apply Rust-Oleum Fillcoat Fibres to polystyrene insulation or onto new concrete (concrete should be at least 2 years old).
  • Do not apply Rust-Oleum Fillcoat Fibres as priming coat under Rust-Oleum Mathys Dac Hydro Alu.
  • When using Rust-Oleum Fillcoat Fibres, smooth out the product in one direction, preferably perpendicularly to the cracks.

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

Brush, Roller, Spray
0.5m² per litre
Touch Dry
1 Hour 30 Mins

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 Lester Cook on 19/06/2019

Is Fillcoat Fibres waterproofer suitable for galvanised steel guttering


Yes – so long as the galvanised steel is in good condition structurally, has no rust, has been thoroughly degreased and will be dry and clean at point of paint application. We would also suggest using Rust-Oleum Mathys Fillcoat first as a kind of primer coat to aid adhesion.

questions Daniel on 11/06/2019

Can you use this on cracks on a fibreglass roof?



questions Ian Smith on 09/04/2019

For inside of iron gutter at what rate per m2 should it be applied 1L or 1.5L /m2? or other? PS referring to Rust-oleum mathys fillcoat.


For waterproofing a gutter we would recommend the application of Rust-Oleum Mathys Fillcoat Fibres over any joints and cracks before applying a coat of Rust-Oleum Mathys Fillcoat over the whole gutter area. To provide a more durable, long lasting finish we'd recommend Rust-Oleum Mathys Fillcoat be applied at 1m²/litre.

questions R. Gale-Brown on 18/03/2019

Could you please advise on the coverage of the rustoleum fillcoat fibres tin Thank you


1.5 litre per m².

questions James Johnston on 16/09/2016
Question: Dear Sir. can you confirm a product that can waterproof an asbestos garage roof and how is it applied .

Rust-Oleum Mathys Fillcoat and Rust-Oleum Mathys Fillcoat Fibres can be used on asbestos but must first be primed with Rust-Oleum Mathys Primer 44 HS. Surfaces should be cleaned and a fungicidal solution to treat and wash the roof with like Rust-Oleum Mathys AMW Fungicidal Wash is always good practice. Be sure to follow government and local authority guidelines - further information on this can be provided by our Technical Department upon request.


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