ALLCOAT Waterproof Coating

A waterproof cement based coating system for masonry and concrete.

Waterproof Coating


25kg – £69.60

ALLCOAT Waterproof Coating is a blend of Portland cements, quality graded aggregates and chemical modifiers which provide a waterproof cement based coating system for masonry and concrete. The product is mixed with water on site and applied by brush or spray. The special mix design produces excellent adhesion to construction surfaces and is safe to apply on damp substrates. The standard product is supplied in grey.

Typical Uses

  • Tanking of basements
  • Sealing of tanks and ducts
  • Coating of brick and blockwork structures
  • Lining of storage tanks for water


All contact surfaces must be clean and sound. Remove all loose material, laitence, dust and any previous coating. Tap off water pressure where necessary and cut out a 20mm x 20mm fillet at the junction of the wall and the floor. Repair any existing cracks and fractures with ALLCOAT Aqua Plug as necessary. All grease or oil contamination should be removed.


Generally no priming is necessary. On dry surfaces, to assist the coating in fully wetting out the substrate, this background should be dampened. On oily surfaces the use of an oil tolerant primer may be required to act as an adhesion promotor.


ALLCOAT Waterproof Coating is supplied in 25kg bags. The water requirement to produce the coating is 7.5 to 8.5 litres per 25kg of dry material. Pour the required quantity of water into a suitable mixing vessel. Slowly add the powder to the water whilst continuously mixing.

Mechanical mixing is recommended using a slow speed high torque drill with a mortar stirrer. Mixing should be continued for three minutes after all the powder has been added to the mixing water to obtain a “creamy” consistency.

ALLCOAT Waterproof Coating is applied in two coats. Brush or spray apply the first coat in a horizontal direction down to the fillet level. After 24 hours seal fillet with ALLCOAT Aqua Plug leaving weep holes free.

Apply a second coat of ALLCOAT Waterproof Coating in a vertical direction covering the fillet with the coating. Remove weep hole taps and seal with ALLCOAT Aqua Plug. If leaks occur, drill 12mm holes adjacent to the leak and seal with ALLCOAT Aqua Plug.


Coarse surface - 2.5 to 3kg per m2 per coat
Smooth surface - 2 to 2.5kg/m2 per coat

Application Notes

Do not retemper stiffened material. ALLCOAT Waterproof Coating should not be applied to frost filled surfaces or when temperature is 5°C and falling.


In warm or windy conditions, mist spraying may be used to compensate for moisture loss. In tanking applications a through flow of air is required to prevent condensation.




Typical properties at 20°C

Water addition

7.5 to 8.5 litres per 25kg unit


2kg to 3kg/m2/coat depending on substrate


8.3m2 to 12.5m² per 25 kg unit depending on substrate

Initial set

330 minutes

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