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: 

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£12.93 Tax incl.


Rust-Oleum Mathys Fillcoat Fibres

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.

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
Dry to Recoat (at 20°C)
3 - 14 days with the same product. 6 weeks with a paint
1,5 l/m²
Recommended Thinner/Cleaner
Thinner 22
Solids by Volume
43 %
485 g/l
Shelf Life (from date of manufacture)
5 years from date of production in unopened cans, if stored in dry, well ventilated areas, not in direct sunlight at temperatures between 5° and 35°C.
Touch Dry
1 Hour 30 Mins
Recommended Dry Film Thickness
430 µm
Recommended Wet Film Thickness
1000 µm
UN Number
Not regulated

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 Hari Ma on 2020-01-13 13:22:24

Hi, could I use this to paint over and seal some small cracks in cement on the top of a chimney stack? thanks


Bare concrete/cement would need priming first with Rust-Oleum Mathys Primer 44 HS prior to application of Rust-Oleum Mathys Fillcoat Fibres. If you only have a few cracks to treat then Rust-Oleum Mathys Elastofill may be suitable instead.

questions Lester Cook on 2019-06-19 18:05:27

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 2019-06-11 20:28:07

Can you use this on cracks on a fibreglass roof?



questions Ian Smith on 2019-04-09 20:28:44

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 2019-03-18 07:55:11

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


1.5 litre per m².

questions James Johnston on 2016-09-16 20:09:03
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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