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Water based Elastomeric Decorative Coating.



A high performance crack accommodating elastomeric acrylic protective and decorative coating for concrete and masonry.



Water based Elastomeric Decorative Coating.


MONODEX SMOOTH is a high performance water based, elastomeric, high build, decorative coating which provides protection against carbonation and water ingress, yet allows damp substrates to breathe without blistering. It’s ultra-fast drying enables two coat applications to take place on the same day and facilitates year round usage, even in uncertain weather conditions. The product is available in a range of attractive colours and prevents the growth of mould and fungi, making it an ideal maintenance coating for internal and external use.


  • High diffusion resistance to carbon dioxide, offering complete protection from the effects of carbonation.
  • Active encapsulated in-film biocide inhibits the growth of mould, mildew and lichens.
  • Advanced micropolymer resin binder and cross-linking system cures to form a durable coating with excellent adhesion to most building substrates.
  • Fast drying to rival solvent based systems, enabling two coat applications on the same day and facilitating year round use.
  • Low hazard, water based product with no flash point. Equipment easily cleaned with water.
  • Low water vapour diffusion resistance allows damp substrates to breathe and dry out without blistering, whilst still providing a tough, impenetrable barrier to further water ingress.
  • High colour pigment concentration obliterates strong underlying colours to produce an attractive matt finish.
  • Easily reinforced locally over cracks and joints, or overall to effectively seal crazed surfaces.

Product Description:

MONODEX SMOOTH is a single component, high build, decorative and protective coating based on an advanced micropolymer resin binder which cross links to give excellent adhesion to most building substrates. The cured membrane is elastomeric, enabling it to facilitate movement in the substrate and to bridge hairline cracks, giving outstanding durability over a service life up to 15 years. Where necessary,

MONODEX SMOOTH can be reinforced either locally or overall to accommodate higher levels of substrate movement. It protects reinforced concrete structures from carbonation and water ingress, whilst allowing the free passage of entrapped moisture from the substrate without blistering the coating or weakening it’s adhesion.

MONODEX SMOOTH is available in a range of attractive shades which give high obliteration of strong underlying colours. An active biocide inhibits the growth of mould and lichens, making it the ideal maintenance coating for both internal and external use.


Modified styrene acrylate copolymer.
Solids Content: 63.9% by weight 59.0% by volume
Specific Gravity: 1.42 VOC
Content: <0.07% by mass.
Colours: Please consult our Technical Department for colour range.
Min. Application Temperature: 3°C
Curing/Drying Time (approx): 1 hour under ideal conditions.
Through dry in 2 to 24 hours, depending on conditions.
Elongation At Break: BS903 Part A2 Unreinforced 279% at 240µm DFT Reinforced (GFM225)27% at 1100µm
DFT Fire Properties: In compliance with BS476 Part 6 & Part 7.

Technical Data (Typical):

Adhesion to Concrete: EN1542:1999 (pull off test) >2.5 MPa at typical DFT
Water Vapour Transmission: BS EN ISO 7783-2:1999 V = 46g/m²/day μ H2O = 2400 Equivalent Air Layer Thickness: SD = 0.48m Class I <5m equivalent air layer thickness Accelerated Weathering: EN 1062-11: No blistering, cracking or flaking after 6000hrs QUV-B weathering.
Permeability to Carbon Dioxide: EN 1062-6 D CO2 = 2.94 x 10-7 (cm2/s) µ CO2 = 507,000 Equivalent Air Layer Thickness: R=121m at 239µm DFT
An effective barrier to CO2 is R >50m Equivalent Concrete Thickness: Sc = 300mm
Pack Size: 15 litres PACKAGING

Shelf Life:

Shelf life is 2 years for unopened containers stored in dry, frost free conditions away from heat.
All tools should be cleaned with water immediately after use.


Brushes: Wide, soft nylon or bristle paint brushes.
Rollers: Use a heavy nap (¾” or 1”) synthetic cover.
Spray: Airless spray can be used with care on smooth substrates only; always finish off in one direction.
Most types are suitable operating at 2500-3000psi tip sizes 17-23 thou. Further details are available on request.

Ensure the moisture content of the substrate is less than 20% wood moisture equivalent. Apply one coat of FLEXCRETE BOND-PRIME to the whole of the prepared surfaces to be treated at a spread rate of up to 5m²/litre by brush, roller or airless spray. Ensure complete coverage, free from pinholes or misses. Rough, porous or uneven surfaces will considerably reduce coverage. For further information, please refer to relevant data sheet.


Apply MONODEX SMOOTH over the primed, dry surface, by brush, roller or airless spray at the nominal coverage rates given below. Allow to dry for a minimum of 1-4 hours in ideal conditions until it is touch dry before applying a second coat as above. To assist application and to act as a guide to coverage rates during application, apply each coat in a contrasting colour.

Coverage rates quoted are for smooth, non-absorbent surfaces. Allowances should be made for uneven or absorbent surfaces.

Reinforcement Cracks and Joints:

MONODEX SMOOTH will accommodate hairline cracks, but larger static cracks require filling beforehand with MONOLEVEL FC. Live cracks, construction joints and joints between dissimilar materials must be filled using a suitable exterior grade flexible filler and the membrane reinforced with FLEXCRETE FLEX-TAPE to provide strategic strengthening. Apply an embedment coat of MONODEX SMOOTH centrally over the crack or joint to embed the reinforcement whilst the coating is still wet. Allow to dry, and if necessary lightly sand to remove any prominent edges before overcoating the whole area with two coats of material, using the coverage rates and techniques described above. Overall reinforcement incorporating CEMPROTEC GFM random weave glass fibre matting is also available. Please contact our Technical Department for further information.

Application Data (Applicatoin guide available on request):

PREPARATION: The areas to be treated must be free from all unsound material, i.e. dust, oil, grease, corrosion by- products & organic growth. Surface laitance & any soft, sandy or flaking material should be removed by mechanical means back to a sound surface, suitable for treatment. Use techniques capable of achieving the required degree of preparation, such as wet grit or water blasting techniques or equivalent approved methods. All Flexcrete Concrete Repair Mortars must be allowed to cure for a minimum of 72 hours. Concrete & cementitious screeds or renders must be a minimum of 10 days old & preferably 28 days. Please contact our Technical Department for further advice on treating MONOLITE is a lightweight, high build, shrinkage compensated, polymer modified mortar for the repair, rendering and profiling of concrete, brick or stone substrates.

Flexcrete Monodex Smooth / Anti-carbonation coatings
Concrete Renovations - Concrete Repair Specialists

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