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Watco Flowpatch Sub Zero

Fast & strong concrete repairs for heavy wear, cold areas. Cures down to -20°C

  • Just add water, mix and pour
  • Takes forklifts in just 2 hours
  • Magnesium phosphate-based formula
  • Allows essential maintenance even in freezing conditions
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Total price

€303.35 (Ex VAT)

This item: Flowpatch Sub Zero 25KG €249.90 (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. 

Recommended areas of use

  • Cold stores
  • Securing railings
  • Poles and posts
  • Roads and manhole frames


  • Easy to use, just add water, mix and apply
  • Magnesium-based formula generates heat when mixed with water, allowing the product to be used as low as minus 20°C
  • Non shrinking
  • Starts to harden in 10 minutes, fully hard in 5 hours when suitably insulated (at minus 10°C)
  • Can be applied at 50mm thick at minus 20°C


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
Finish Smooth
Interior or Exterior Exterior, Interior
Composition Magnesium phosphate cement based powder
Coverage 0.25m² per 10kg at 20mm, 0.6m² per 25kg at 20mm
Application tools Trowel
Application Trowel into hole
Curing time (at -10°C) 5 hours
Minimum application temperature -10°C
Pot life 10 minutes
Depth (mm) 10mm


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

Case studies

Data sheets

Data sheets

Technical data sheets

Technical Data Sheet


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€249.90 (Ex VAT)

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Watco Flowpatch Sub Zero