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MMA Clear Waterproof Flexi-Sealer

CP935 is a medium viscosity, flexible and UV protected surface sealer based on acrylic resins. The curing is initiated by addition of CP510 MMA Initiator.

CP935 is used as a surface sealer for TREMCO MMA waterproofing systems to improve general resistance and maintenance properties.

  • Easy to apply
  • Fast curing
  • Semi-flexible
  • Weather resistant
  • Acid rain resistant

Method of Application

  • The TREMCO MMA system to be sealed must be dry, clean, free from dust and grease.
  • Any fresh base coat must be completely cured.
  • For broadcast systems all loose aggregate or flakes must be thoroughly removed prior to applying the CP930.


  • Prior to use, CP930 must be carefully stirred to achieve a uniform distribution of the paraffin and fillers contained in the product.
  • Add 10% by weight, or as otherwise directed by tremco illbruck technical services, CP935 micronised pigment in the required colour and mix thoroughly until uniformly distributed.
  • CP935 is thoroughly mixed together with the CP935 MMA Initiator (50% dibenzoyl peroxide), in accordance with the below guidelines.

It should be noted that the amount of catalyst powder to be added depends upon the temperature.
- at 30°C add 180 g of catalyst to each 22 kg pail
- at 20°C add 360 g of catalyst to each 22 kg pail
- at 10°C add 540 g of catalyst to each 22 kg pail
- at 0°C add 720 g of catalyst to each 22 kg pail

For eventual addition of filler or pigment on site, please contact our Technical Service Department for further details.

Note: Weight to Volumetric conversion of Catalyst.
1 cm³ of CP510 MMA Initiator  = 0.64 g
1 g of CP510 MMA Initiator = 1.57 cm³

Method of Application

  • Immediately after the catalyst has been added and mixed, the sealer is spread onto the CP215 MMA Base Coat using a rubber squeegee and paint roller.
  • For good results it is important always to work with freshly catalysed material (i.e. small batch sizes).
  • Layer thickness must be kept within 0.6-0.8kg/m² on aggregated surfaces, 0.3-0.7kg/m² on non-aggregated surfaces.

For full application details, contact tremco illbruck customer services on 01942 251400.

Technical data

PROPERTYRESULT (Typical Values for Pigmented CP930)
CompositionPolyurethane coating based on advanced PU technology
(DIN 53018
@ +25°C)
190 - 270 mPa*s
(EN ISO 2811
@ +25°C)
1.10 g/ml
Pot Life/Processing Time
Approximately 15 minutes
Curing Time 
(@ +25°C)
Approximately 60 minutes
Recoat Time 
(@ +25°C)
Approximately 90 minutes
Flash Point
(EN ISO 1516)
Tensile Strength
(EN ISO 527)
13.5 MPa
(EN ISO 527)
Elongation at Maximum Strength
(EN ISO 527)
Shore D Hardness
(DIN 53505)
Abrasion Taber 500 Cycles51 mg
Modulus of Elasticity
(EN ISO 527)
345 MPa

Consumption of CP935 depends on the system and varies up to 0.8 kg per m²

StorageStore in shaded dry conditions between +10°C and +20°C
Shelf Life6 months when stored as recommended in original unopened containers
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