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

• Exceptional surface key: Promotes render adhesion on concrete, brick, block, and plaster
• Replaces scratch coats: Eliminates the need for an initial keying layer on many substrates
• Controlled application: Grey tint ensures even, visible coverage
• Ready to use: No mixing required—apply directly with brush or roller
• Sustainable formulation: Contains ~20% recycled content

Technical Specifications

• Form: Viscous liquid
• Colour: Grey
• Coverage: 2–4 m² per litre depending on substrate
• Drying Time: Typically 24 hours
• Application Temperature: Above +5 °C
• Shelf Life: 12 months in unopened packaging

Application Guidelines

1. Ensure surface is dry, clean, and free of dust, oil, or loose material.
2. Apply directly from the container using a soft brush or roller.
3. 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.