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. Seals leaks and cracks quickly and simply, even in bad weather.

  • Repairs holes and cracks up to 2mm instantly
  • Excellent adhesion to various substrates
  • Can be applied in all weather conditions
  • Direct repair of gutters, roofs, chimney stacks, pipes and more
  • Bitumen-free formula
  • Stops leaks instantly, crackbridging

£81.17 Incl. VAT
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Available for Delivery (See Delivery Options Below)


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.

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Features & Benefits

  • Immediate waterproofing against leaks
  • Contains fibres for bridging of cracks up to 2mm
  • Can be applied in all weather conditions
  • Bitumen-free formula
  • Product is recoatable with Dacfill, Dacfill HZ
  • Long shelf life
  • For flat and pitched roofs, non-walkable terraces, gutters, ridge-pieces, chimney stacks, pipes, etc
  • Also available as a smooth version (Rust-Oleum Mathys Fillcoat)

Theoretical Consumption

  • 1 coat of 1,5 l/m²

Drying Times

  • Dry to recoat: 3 - 14 days with the same product. 6 weeks with a paint.


  • Remove dust, mud, grease, moss and withered leaves carefully.
  • The spots to be repaired are cleaned with a hard broom and sponged.
  • Fillcoat Fibres can 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 Primer 44HS.
  • In case of repeatedly repaired spots, important or active cracks, apply Fillcoat Fibres crosswise over the cracks or fissures.


  • To ensure homogeneity, coating materials should be thoroughly stirred prior to use.
  • Can be applied during all weather conditions, except for snow.


  • Do not dilute.


Shelf Life & Storage

  • 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.

Safety Data

VOC level: 485 g/l
VOC readymix: 485 g/l
VOC category: A/i
VOC limit: 500 g/l
Grenelle: Exterior


Consult Safety Data Sheet and Safety Information printed on the can.

Product Details

Data sheet

For Use By
General Use
For Use By
Industrial Use
For Use By
Professional Use
Interior / Exterior Use
Interior / Exterior Use
Water / Solvent Based
For Use On
Zinc, Aluminium, Polyester, PVC, Glass, Concrete, Stone, Wood
Application Method
Standard / Ready Mixed
Single, Two or Three Pack
Single, Two or Three Pack
Pack Size
1L, 5L, 20L
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
Product Type
Fastest Delivery
Next Working Day

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 Alf on 2022-03-24 18:38:42

Can this be used on the bottom of a fiberglass sailing dinghy. Existing fiberglass has some crazing and hairline cracks appearing.


Unfortunately no, we do not have a product to recommend for repairing the fibreglass hull.

questions Ash on 2020-12-28 19:08:54

Can I use this for my fish pond. Thanks


No, this product is not suitable for application to a pond.

Assuming the pond is concrete, clean, sound and prepared as detailed in the technical data sheet we can recommend Teamac Chlorvar Chlorinated Rubber.

The pond should not be refilled until completely dry, approximately 14 days.

questions Robert Taylor on 2020-11-06 11:43:00

I have replaced my wooden gutters with similar size plastic gutters some years ago. The joints on these gutters have started to leak and try as I might I can’t seem to stop the leaks. Would this product be suitable to stop them leaking. Thank you.


Assuming the gutters are PVC, clean, dry, sound and no cracks are larger than 2mm we can recommend Rust-Oleum Mathys Fillcoat Fibres for this application.

questions John nicholson on 2020-05-24 09:07:40

How long does this product last once applied on a GRP flat roof?


We would suggest 5 to 10 years, but this is heavily dependant upon a high level of surface preparation and correct application as detailed in the Technical Data Sheet.

This can be found in the attachment tab on the product page.

questions Mrs. Talbot  on 2020-01-26 15:09:35

Would your product seal a crack in lead flashing.??


Providing the surface is clean, Rust-Oleum Mathys Fillcoat Fibres can bridge cracks up to 2mm wide and is suitable for lead.

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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