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Watco Bund Sealer

Unique formula seals and contains chemical spills

  • Guarantees exceptional chemical resistance
  • Glass flake reinforced formula
  • Thick epoxy resin – only one coat needed
  • Flexible and waterproof

Frequently bought together


Watco Bund Sealer is a two part, thick epoxy resin, one coat is generally enough to achieve a waterproof seal that is highly chemical resistant. New easier to apply formula with glass reinforcement for even greater resistance to chemical attack.

Recommended areas of use

  • Protection to metal tanks and pipes
  • Can be used to protect metal and concrete structures prior to sinking into earth or water


  • Suitable for internal and external use
  • Can be applied to damp surfaces
  • Excellent resistance to petrol, diesel, acids, alkalis and solvents (see datasheet)
  • Fills cracks between bund wall and floor
  • Flexible chemical and waterproof coating
  • Guarantees exceptional resistance to chemicals - including skydrol
  • Can be used with Watco Fibreglass Reinforcing Tape to fill cracks and joints between bund wall and floor
Properties New, easier to apply' formula, can be applied to damp surfaces, excellent resistance to petrol, diesel, acids, alkalis and solvents, fills cracks between bund wall and floor.
Surfaces Floors or walls.
Interior or Exterior Interior and exterior.
Primer required No.
Coverage 14m² per 4L per coat.
Recommended number of coats 1
Pot time (hours) Up to 25 minutes at 20°C.
Curing time Light traffic in 24 hours, 7 days for full chemical resistance at 10°C.
Minimum application temperature Air temperature: 10°C, floor temperature: 5°C.

Surface preparation

Ensure surfaces are clean, sound and free of contaminants. Large cracks in the surface should be repaired prior to Application of Watco Bund Sealer. Minor cracks and joints can be bridged by Bund Sealer with Watco Fibreglass Reinforcing Tape. Remove grease and oil using Watco Bio D.

Watco Bund Sealer can be applied to damp surfaces, although for more permanent installations we recommend that the surface is as dry as possible. Watco Bund Sealer can be applied to painted surfaces but all loose or defective paint should be removed first. Remove loose rust from metal (it is not necessary to remove all ‘well bonded’ rust). Heavily corroded, very rusty metal can be primed with Watco Primebase.


Add the contents of the 2 inner tins to the outer tin. Part Mixing is not recommended. Using a flat bladed palette-knife or similar tool, scrape all the material from the inside of the tins and mix thoroughly.


If appearance is critical we recommend the Application of a small trial area first.

Apply by brush, working well into the substrate. The product can be brushed thickly over hairline cracks and joints. One coat is generally sufficient to produce a watertight seal. A second coat may be required on very porous surfaces or to produce a continuous film over rough surfaces.

£171.40 (Ex VAT)

In stock

Do you know the size of the area?

Tools and accessories

Watco Fibreglass Reinforcing Tape

Watco Fibreglass Reinforcing Tape

Strengthens and waterproofs joints and cracks in bund areas

£31.50  (Ex VAT)

Paint Brush

Paint Brush

Professional paint brushes suitable for all coatings

From £2.20  (Ex VAT)

What our customers say

Help & Advice

Contact our friendly and professional Technical Advisors for expert help and advice for your project. You can give us a call on 01483 418 418 or email

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