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Watco Flowpatch Sub Zero

Fast & strong repairs for heavy wear areas in -20°C

  • Just add water, mix and pour
  • Takes forklifts in just 2 hours
  • Magnesium phosphate-based formula
  • Allows essential maintanence even in freezing conditions
Delivery options
We are currently unable to offer our normal delivery service to Northern Ireland for this item. Please contact us for further details

Frequently bought together

Total price

£118.30 (Ex VAT)

This item: Flowpatch Sub Zero 10KG £76.80 (Ex VAT)


Watco Flowpatch Sub Zero is ideal for concrete floor repair in cold rooms. It will cure very rapidly to withstand heavy traffic, even at -20°C. Ideal for repairing holes or leveling damaged concrete floors. 


  • Easy to use: just add water, mix and apply
  • Magnesium phosphate-based formula generates heat when mixed with water, allowing the product to be used as low as -20°C
  • Extremely tough: can withstand weight of up to 350kg/cm
Properties Will cure at minus 20 degrees, easy to use, just add water, mix and apply, magnesium phosphate-based formula, extremely tough.
Suitable for Concrete
Interior or Exterior Interior and exterior
Composition Magnesium phosphate cement based powder
Coverage 0.25m² per 10kg at 20mm, 0.6m² per 25kg at 20mm
Curing time 5 hours at minus 20°C
Minimum application temperature Minus 20°C
Pot life 10 minutes.

Surface preparation

Remove all loose material including dust, oil and grease. Minimum application depth should be 20mm. Repair edges should be cut to depth to avoid feather-edging. Dampen bare concrete with clean, cold water. Remove any standing water. Briefly warm the area using a blowlamp or gas torch. This helps to accelerate curing. 

Warning: do not mix the product for more than 4 minutes. Use immediately. Watco Flowpatch Sub Zero cures very quickly and the mixed product must be applied and finished within 10 minutes.


Mixing must be carried out in an ambient temperature above 5°C. If mixing at temperatures below 5°C, pre-warm the mixing vessel with warm (approximately 25 - 30°C) water. Remove the bag of powder and pour 2 litres of clean, cold water into the plastic container. Gradually add all the powder, mixing thoroughly. Continue mixing to produce a smooth workable mortar.


Trowel Watco Flowpatch Sub Zero firmly into place using a steel trowel or float. The trowel can be wiped with clean, cold water to make finishing easier. Apply the product at a minimum 20mm thickness, if using at a temperature range of - 20°C to 5°C.

Case studies
Data sheets

Safety data sheets

Safety Data Sheet

Technical data sheets

Technical Data Sheet
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£76.80 (Ex VAT)

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Delivery options
We are currently unable to offer our normal delivery service to Northern Ireland for this item. Please contact us for further details

Tools and accessories

Trowels and Floats

Trowels and Floats

Ideal for mixing, applying and levelling repairs

From £3.60  (Ex VAT)

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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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