Three component epoxy resins to waterproof both with negative and positive pressure, to be used as osmotic over underground walls, to encapsulate rising dampness and to achieve a vapour barrier on wet supports.

1.00 kg/m²
Value referred to the application as osmotic.
Applied as waterproofing in
counterthrust the yield is 2.00 kg/m² - 31.17 ft²/gal.
Value referred to a temperature of 20°C - 68 °F and with relative humidity level of 40%.

Colors shown are for illustrative purpose.


5 kg - 0.86 gal plastic bucket.

10 kg - 1.73 gal plastic bucket.



Watstop is an epoxy-cement waterproofing characterized by high resistance to negative pressure.  Product suitable in tunnels, cellars, basements, garages, elevator shafts, underground rooms and any wet support or surface affected by rising dampness.  Compared to traditional systems, that requires thicknesses not smaller than 1.5 cm - 1.18 inch, this product guarantees excellent waterproofing with just 2.5 – 3.0 mm / 0.10 - 0.12 inch.  Its extreme versatility allows to use it as vapour barrier for wet supports as encapsulating for rising dampness.  It can be applied by roll, brush or spatula and once dried it can be coated with plasters, smoothers, resins, adhesives, coatings, tiles or paints.


Aspect: Paste

Components: Three-component (A+B+C)

Impermeability: Positive pressure: 9.5 ATM - 132.3 psi

Impermeability: Negative pressure: 9.5 ATM

Adhesion to cementicious support: 2.5 N/mm2 - 362.59 lbf/in2 (good)

Adhesion to tuff: 3.0 N/mm2 - 435.11 lbf/in2 (good)

Adhesion to chipping floor: 1.5 N/mm2 - 217.56 lbf/in2 (good)

Adhesion to EPS: 1.5 N/mm2 - 217.56 lbf/in2 (good)

Adhesion to glazed ceramic tile: 2.5 N/mm2 - 362.59 lbf/in2 (good)

Adhesion WATstop + Acriflex Winter to polyurethane foam: 1.83 N/mm2 - 265.42 lbf/in2 (good)

Pot Life: 2 hours at 20°C - 68°F and with relative humidity level of 40% (high temperatures decrease workability time)


  • Versatility of use

  • Resistant up to 9.5 ATM of negative pressure

  • Resistant up to 9.5 ATM of positive pressure

  • Adhesion on any kind of surface

  • It allows  waterproofing permanently applying just a few millimeters

  • It achieves a good adhesion bridge for any plaster, glue or finishing coat

  • Applicable even during winter (up to +5°C - 41°F)

  • Ageing resistance

  • No maintenance needed