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 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.
