Professional-Grade Surface Preparation for External Rendering
Bostik Renderers Stabilising Primer, powered by Plasprime® Technology, is developed for the rendering professional. It primes and stabilises both porous and non-porous external surfaces, ensuring excellent adhesion and a uniform substrate for new render applications. Grey in colour for easy visibility, it also contains approximately 20% recycled material, supporting more sustainable building practices.
Key Features & Benefits
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Exceptional surface key: Promotes render adhesion on concrete, brick, block, and plaster
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Replaces scratch coats: Eliminates the need for an initial keying layer on many substrates
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Controlled application: Grey tint ensures even, visible coverage
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Ready to use: No mixing required—apply directly with brush or roller
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Sustainable formulation: Contains ~20% recycled content
Technical Specifications
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Form: Viscous liquid
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Colour: Grey
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Coverage: 2–4 m² per litre depending on substrate
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Drying Time: Typically 24 hours
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Application Temperature: Above +5 °C
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Shelf Life: 12 months in unopened packaging
Application Guidelines
- Ensure surface is dry, clean, and free of dust, oil, or loose material.
- Apply directly from the container using a soft brush or roller.
- Allow to dry fully (approx. 24 hrs) before applying render.
Product Comparison: Stabilising Primer vs Common Alternatives
| Feature / Product |
Bostik Renderers Stabilising Primer |
SBR Bonding Agent |
PVA Bonding Agent |
Traditional Scratch Coat |
| Purpose |
Priming & stabilising before render |
Bonding agent for difficult substrates |
Bonding & sealing |
Mechanical keying layer |
| Porous Surfaces |
✔ |
✔ |
✔ |
✔ |
| Non-Porous Surfaces |
✔ |
⚠ Requires mechanical key |
✘ |
✘ |
| Replaces Scratch Coat |
✔ |
✘ |
✘ |
N/A |
| Ready to Use |
✔ |
✘ (dilution needed) |
✘ (dilution needed) |
✘ (site mix) |
| Coloured for Visibility |
✔ Grey |
✘ Clear/white |
✘ Clear |
✘ |
| Interior/Exterior Use |
✔ Both |
✔ Both |
✘ Mainly interior |
✔ Both |
| Adhesion Strength |
⭐⭐⭐⭐ |
⭐⭐⭐⭐ |
⭐⭐ |
⭐⭐⭐ |
| Contains Recycled Material |
✔ ~20% |
✘ |
✘ |
✘ |
Storage & Safety
- Store upright between +5 °C and +30 °C in a dry place, protected from frost and sunlight
- Secure lid tightly after use to prevent drying
- Clean tools immediately with water
- Refer to SDS for full handling precautions
Bostik Renderers Stabilising Primer simplifies exterior wall preparation—cutting labour, increasing consistency, and delivering dependable adhesion for professional render applications.