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Watco Asphalt Crack Filler

For repairing and filling cracks in old asphalt and tarmac

  • Cures in 2 to 4 hours
  • Stops water ingress and erosion damage
  • Rubberised bitumen formula
  • Flexible and copes with movement
Frequently bought together


Unsightly cracks in asphalt can lead to water ingress, erosion and accelerated deterioration of the surface. This rubberised bitumen based product makes crack repairs easy. Simply decant the liquid into a watering can (or any spouted can) and pour into the crack. 

Recommended areas of use

  • Car parks
  • Walkways
  • School playgrounds
  • Tarmac and asphalt surfaces


    • Flexible to allow for expansion and movement
    • Ideal for cracks up to 3mm wide
    • Cracks 3-25mm wide can be filled by mixing Watco Asphalt Crack Filler with sand
    • Long lasting protection against ingress of water
    • Can be overcoated with Watco Asphalt Paint or Watco Black Top if required
    • Suitable for inside and out
    • Excellent adhesion


Properties Flexible, long lasting, protects against ingress of water, can be overcoated, inside or out, excellent adhesion
Suitable for Asphalt/tarmac
Appearance Black
Interior or Exterior Exterior, Interior
Primer required No primer required
Composition Single pack, rubberised bitumen emulsion
Number of components 1
Coverage Approximately 100m x 5mm wide x 5mm deep crack per 5L
Application tools Spouted can
Curing time (at 15°C) 6 hours
Minimum application temperature 5°C
Shelf life 12 months in unopened container
Depth (mm) 25mm
Principle limitations This product is designed for use on bitumen based surfaces. It could soften surfaces which contain coal tar. If in doubt, apply a test area and check after 24 hours that no softening has occurred
Cleaning tools Use water and detergent if the product has not dried. Once dried, use white spirit



Sweep or scrape out loose debris from the crack.


Mix well before use. Do not use in wet or cold (below 5°C) conditions. Damp or cold weather will delay the drying time. The crack should be reasonably dry, although a little dampness may be tolerated.

Cracks up to 3mm wide: Pour the Watco Asphalt Crack Filler into the cracks using a spouted jug. Alternatively a watering can may be used. Brush out to a thin film any surplus liquid which overflows the edges of the crack. Once the Watco Asphalt Crack Filler has dried, dust with very fine sand or cement to remove any residual tack.

Cracks 3mm - 25mm wide: Prime the sides of the crack with a brush coat of Watco Asphalt Crack Filler. Mix Watco Asphalt Crack Filler with damp sand to produce a slightly stiff mortar. Trowel into the crack and smooth off. Once the mortar is dry, dust with very fine sand or cement to remove any residual tack.

Drying times vary widely depending upon weather conditions and size of crack. Dry, warm conditions will accelerate drying. The product sets by evaporation of water. Damp, cold conditions will therefore delay drying. As a guide, approximately 2-4 hours should be allowed for cracks up to 3mm and 6-10 hours for cracks up to 25mm.

Data sheets

Data sheets

Safety data sheets

Safety Data Sheet (IE)

Technical data sheets

Technical Data Sheet
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€55.45 (Ex VAT)

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Watco Asphalt Crack Filler