Rendagrip Bonding Agent 10ltr

507 Rendagrip Bonding Agent is a red, liquid bonding agent formulated for use beneath external render systems. It contains fine aggregate suspended within a waterproof polymer, producing an even distribution of particles across the surface. This provides a mechanical key and reduces the porosity of the underlying substrate. The product is supplied ready to use and is intended for application to concrete, lightweight blockwork, brickwork and other smooth or porous mineral substrates. 

5850 Rendagrip Bonding Agent

Features and Technical Characteristics

The bonding agent incorporates a fine aggregate that assists in forming a consistent key coat. The waterproof polymer dispersion ensures that the aggregate remains suspended during application, helping to achieve uniform coverage. The red colour aids visual checks during installation to avoid missed areas.

Key technical characteristics stated in the data sheet include:

• Appearance: red liquid

• pH value: 8.0–9.5

• Viscosity at 23°C: 15,000–50,000cP

• Minimum film-forming temperature: approximately 5°C

• Bond strength to EN13892-8: 3.2N/mm²

• High-temperature stability (4 weeks at 50°C): stable

• Packaging: 10L pail

• Shelf life: 24 months in unopened containers

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Intended Applications

The product is intended as a bonding agent for render applications on:

• Concrete, brickwork and blockwork

• Smooth surfaces where improved adhesion is required

• Porous substrates where reduced suction is needed

These uses are specific to the detail within the technical data sheet and relate only to mineral substrates suitable for rendering. 

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Preparation

Substrates must be sound, clean and capable of providing adequate support. Surfaces must be free from dust, release agents and frost. Ambient temperatures during application must be above 5°C. If there is any uncertainty about substrate suitability, a test patch should be carried out. 

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Application Guidance

The product must be stirred well before use and applied as a single coat using a short-pile roller or brush. One uniform coat should be applied to avoid weak spots caused by uneven aggregate distribution. Adjacent surfaces should be protected from splashes, and any contamination removed before drying using warm soapy water.

Drying time before applying render is typically a minimum of 6 hours; lower temperatures will extend this period. The product can be applied to damp surfaces but must not be used in areas subject to constant damp. It must not be diluted and should not be used where the complete render system would exceed a maximum depth of 25mm. 

5850 Rendagrip Bonding Agent - …

Storage and Handling

The bonding agent should be stored between 5°C and 25°C and protected from frost. Shelf life is stated as 24 months when stored in original unopened containers. Packaging components, including plastic tubs, lids and metal handles, are stated as recyclable through appropriate schemes. 

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Limitations

• Do not apply or allow curing below 5°C

• Not suitable for areas exposed to continuous damp

• Must not be diluted

• Maximum complete render system depth: 25mm

Technical Data