Elastomeric crack-bridging cementitious waterproof membrane
Vetoproof CM745 is a two component flexible polymer modified cementitious waterproof coating, it has unique crack bridging characteristics even after long term water immersion. The product is suitable for use and contact with potable water and can withstand negative hydrostatic pressure.
Vetoproof CM745 supplied in 20 Kg Kit
Theoretical Coverage - 0.7 - 1.7 Kg /m2 / Coat
Original sealed container of Vetoproof CM745 and has a shelf life of 12 months provided it is stored clear of ground in a dry shaded place below 35ºC.
Vetoproof CM745 liquid concentrate should be poured from the plastic container into a suitably sized mixing container. Commence mixing with a propeller agitator attached to a slow speed drill (300-500 rpm). The powder component should be added gradually to the liquid to avoid lump formation and mixed for 2 to 4 minutes. Vetoproof CM745 should be immediately used after mixing. Do not mix more material than can
be used within the pot life. Keep mixing Vetoproof CM745 during the application.
Pre-wetting of the substrate
Thoroughly dampen the substrate surface with water using a brush roller or spray bottle. High porosity substrates will require more dampening than dense substrates. Do not apply the coating when the substrate is wet, but allow the water to soak in until the substrate is just visibly damp prior to proceeding. Any excess water should be removed using a sponge. Any running water should be stopped with a suitable plugging mortar such as Vetoproof CR747. Contact the local Saveto office for further advice on other suitable water stopping materials. For optimum use of the product, Vetoproof CM745 white should be applied as the first coat, with Vetoproof CM745 grey as the second coat. This gives a visual indication of coverage.
The first coat should be applied at a wet film thickness of 1 mm (approximate coverage per coat is 1.7 kg/m2 or 1 liter / m2). To ensure the correct thickness is achieved measure out an area (for example 200 m2) then calculate how much material will be needed to cover this area. Monitor the coating thickness during application at regular intervals using a wet film gauge. Care must be taken to attempt to fill all imperfections such as blow holes during the application. If not they can be filled while the coating is still fluid by using a dry sponge. If the coating has dried before these imperfections are found they can be filled using fresh material.
All the mixed material should be used within the pot life of the product. Allow the first coat to cure for a minimum of 4 hours at 20ºC per 50% RH and longer at lower temperatures or higher humidities.
The exact drying time will depend on surface temperature, relative humidity and air movement. High temperatures and/or low humidity will reduce the drying time. This can vary from 1 to 16 hours. The first coat should be left to dry until firm and non-markable to the touch. There is no maximum time between coats, however the surface may need cleaning with water prior to the application of the second coat to remove potential contamination.
The second coat should also be applied at a wet film thickness of 1 mm. Pre-dampening of the surface is not necessary prior to applying the second coat.
Vetoproof CM745 is self curing, however the freshly applied coating should be protected from rain and strong wind or until firm to the touch to prevent damage to the wet coating.
The most suitable type of brush is a soft bristled wallpaper paste brush (120 to 220 mm wide). Where larger areas are to be applied it is advisable to use a brush with a handle. Load the brush up well and spread the material to the required thickness. If the brush begins to drag during application, do not add water to the material, but dampen the surface again. Finish in one direction for a neat appearance. For floor application, a soft bristled broom is recommended. Pour the material on to the substrate and then spread to the required thickness.
Application by roller has the benefit of speed over brush application, particularly on smooth substrates. A good quality medium hair roller is recommended. The roller should be well loaded for ease of application. A heavy roller pattern will be left, therefore it is important to use a finishing tool to produce a smooth coating, with a uniform 1 mm wet film thickness.
A finishing tool may be required to produce a smooth finish or to repair film defects. Example of suitable tools include a steel plastering trowel, a caulking tool and a hard sponge. All of these must be used immediately after coating application, otherwise the coating may drag or tear. When using a hard sponge it should be dry or very slightly damp. A wet sponge should not be used as this will cause polymer to come to the surface of the coating which causes an unsightly white, streaky effect.
For further details about Spray Application, refere to Vetoproof CM745 Technical Data Sheet.
All surfaces should be dry and free from contamination such as oil, grease, loose particles, decayed matter, moss algal growth, laitence, and all traces of mould release oils and curing compounds. This is best achieved by lightly grit-blasting the surface. Where moss, algae or similar growths have occurred, treatment with a proprietary biocide should be carried out after the grit-blasting process. Spalled and deeply disintegrated concrete should be removed to sound concrete and repaired with a Saveto repair system. If the surface contains small blow-holes, typically less than 1 mm wide, the coating can be applied directly onto the substrate without the need for a treatment. Cracks which are less than 0.3 mm in width can be overcoated as long as the crack is not likely to open up to greater than 0.3 mm. Cracks which are greater than 0.3 mm in width should be chased out to 4 mm in width and approximately 15 mm in depth. This should be filled with Vetoproof CM745. When the material in the crack has hardened the coating should be applied over the crack.
Do not apply the product at temperature less than +5ºC.
For further information contact our technical department.
Vetoproof CM745 powder is irritating to the eyes, respiratory system and skin. Avoid inhalation of dust and wear suitable respiratory protective equipment. Vetoproof CM745 liquid is not classified as dangerous. Vetoproof CM745 when mixed becomes highly alkaline. Wear suitable protective clothing, gloves and eye protection. For both components and for the material when mixed avoid contact with eyes or skin rinse immediately with plenty of water and seek medical advise. For further information please refer to the Product Safety Data Sheet. Waste material should be allowed to harden overnight then disposed of a non-hazardous waste.
Vetoproof CM745 is non-flammable.
Saveto endeavors to ensure that any advice, recommendations, information it may give, is accurate and correct. It cannot accept any liability either directly or indirectly arising from the use of its products, because it has no direct or continuous control over where or how its products are applied, whether or not in accordance with any advice, specification, recommendation or information given by us. Saveto has the right to change any of the specifications mentioned in the Technical data sheets upon its discretion without prior notification.
Hard copies of TDSs are printed once or twice a year, while our technical data sheets are continuously being updated as per R&D improvements and new 3rd party testing; kindly refer to our website for the latest updated TDSs.
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