Article No. 057525
Specially formulated undercoat render
Product specifications
On delivery
The stated values represent typical product characteristics and are not to be construed as binding product specifications.
Field of application
- Undercoat render for reconstructing the texture and composition of the original render
- Levelling out substrates
Properties
- Reproduction of the original state in accordance with monument preservation targets
- Specially adapted binder
- Specially adapted grain size distribution
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Preparation
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Substrate requirements
Clean, dust-free and capable of supporting a load.
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Preparations
Substrate: absorbent with low strength
Apply product as a bonding layer > 50% opaque.
Substrate: weakly absorbent
Apply nodules of CL Prep Historic (Art. 0574) as a full-coverage bonding layer.
Alternatively, apply the product as a scratch coat (contact layer).
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Application
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One-layer
Apply product using a suitable tool or machine.
Single layer thickness: 10 - 20 mm
Two-layer
Roughen the first layer with a render comb.
Apply second layer once sufficiently dry.
Single layer thickness: 10 - 20 mm
Level off surface with a long float.
Use a render comb to roughen horizontally in preparation for the next layer of render after setting.
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Application instructions
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Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.
When applying multiple layers, ensure sufficient standing time between applications.
Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.
Hairline/shrinkage cracks are safe and are not cause for complaint as they do not impair the properties of the mortar.
Since the material is formulated for a specific object, application by machine cannot be guaranteed.
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Working tools / cleaning
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Mixing tool, trowel, smoothing trowel, aluminium cartouche
Clean tools with water while the material is still fresh.
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Storage / shelf life
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Dry, in unopened containers, 6 months.
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Usage
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Dependent on building and formulation
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Apply to a large enough trial area to determine the precise amount required.
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General information
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The mixing water must be of drinking water quality.
May contain traces of pyrite (iron sulphide).
Do not use on gypsum-based substrates.
Low chromate content in accordance with Directive 2003/53/EC.
The characteristic data of the product were calculated under laboratory conditions at 20°C and 65% relative humidity.
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Disposal instructions
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Larger quantities of leftover product should be disposed of in the original containers in accordance with the applicable regulations. Completely empty, clean containers should be recycled. Do not dispose of together with household waste. Do not allow to enter the sewage system. Do not empty into drains.
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Safety / regulations
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For further information on the safety aspects of transporting, storing and handling the product and on disposal and environmental matters, please see the current Safety Data Sheet.
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