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MasterSeal M 861 Polyurea (10 KG) Waterproof Roof Coating (paint or roller on)

Save £85.97 inc.VAT

Sale price£170.65 inc.VAT Regular price£256.62 inc.VAT



MasterSeal M860 and M861 are hand applied polyurea waterproof roof coating systems, 2-component, solvent free, elastomeric waterproof liquid polyurea coatings ideal for flat roofs, balconies, Terraces, Podium Decks and Walkways with high crack bridging property.

MasterSeal M860 is self-levelling.

MasterSeal M861 is thixotropic for applications to steeply sloping and vertical surfaces.



MasterSeal M860 and M861 are used in a variety of waterproofing applications including flat roof waterproofing, balconies, terraces, podium decks, car park decks and water industry applications.

Two-part, hand-applied, rapid-curing, hydrophobic and chemically resistant polyurea waterproofing membrane

When you have essential waterproofing requirements or repairs and need to get facilities back into service as quickly as possible, a fast-track waterproofing membrane can save money. MasterSeal is a two-part, hand-applied, rapid-curing polyurea membrane that enables structures to be recommissioned with minimal downtime. It provides long lasting waterproofing with high elasticity for thermal movement. As a seamless coating (no joints or overlaps) there is no risk of leaky joints with excellent crack-bridging and chemical resistance.


MasterSeal - Polyurea has similar chemical and physical properties to regular spray-applied polyurea, but without the need of costly and specialist hot spray equipment.

MasterSeal - Polyurea can be easily and seamlessly applied by brush, roller or squeegee.

This self-smoothing and self-levelling hydrophobic membrane is UV-stable and doesn't  require a top coat. It be applied on horizontal surfaces but also on vertical surfaces and soffits with the addition of a thixotropic additive.

  • Monolithic – no laps, welds or seams
  • Fully bonded
  • High water vapour permeability
  • Excellent mechanical properties
  • Excellent crack bridging capability
  • Resistant to puncture
  • Resistant to standing water
  • Mhermoset – does not soften at high temperatures
  • Remains elastic at low temperatures eg approx. - 45ºC
  • Non-solvented
  • ​Rapid curing: accepts light foot traffic after 4 hours at 20ºC
  • Hydrophobic material, so waterproofs the roof instantly
  • Highly elastic, can bridge cracks
  • Non-slip top coat available 
  • High tensile and tear strength, meaning the membrane remains durable where others tear


45 minutes when hand mixed at 20ºC ambient and substrate temperature


MasterSeal M860 Typically 1.35kg/m² per mm thickness. Minimum membrane thickness: 1.5mm.

MasterSeal M 861 Polyurea (10 KG) Waterproof Roof Coating


In roofing applications, the asphalt should be cleaned by high pressure water jetting. In mechanically stressed applications the load bearing capacity of the asphalt should be suitable for the intended use and should be shot blasted so that at least 60% of the surface aggregate is ex-posed (min. quality e.g. AS-IC10). Blisters should be warmed, redressed and a de-bond tape applied over. Bituminous felts Blisters should be opened, dried out and repaired. Major cracks should be repaired and taped with de-bond tape.

Warning: MasterSeal M 860 will not bond to black APP modified bitumen felts nor is a suitable primer available.


All joints should be flush and taped prior to the application of the primer. All fittings must be flush with or sunk lower than the surface.

Iron and steel

Should be sand blasted to SA 2½ finish prior to application of the primer.

Substrate Primer

Bitumen felt - MasterTop P 698

Concrete cementitious / screed - MasterTop P 617 or MasterTop P 650

Asphalt screed (mind. AS-IR10) - MasterSeal P 660 or MasterTop BC 375 N

Plywood (preliminary tests are recommended) - MasterSeal P 660 or MasterTop P 691 GRP / GFK MasterTop P 691

Iron and Steel - MasterTop P 681 Non-ferrous metals (e.g. aluminum, zinc) MasterTop P 684 Aged MasterSeal membrane MasterTop P 691

Click here for relevant MasterSeal polyurea primers.

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