Johnstone's Trade Stormshield High Performance Key Coat Primer is a high polymer render that helps render basecoat adhere to old, problematic surfaces (non paint). It is a modified, cement-based solution with fibre reinforcement, so it is specially developed to aid adhesion of render to difficult masonry substrates. This Stormshield primer should only be used as part of a render system (applied directly onto masonry surfaces in a Stormshield Render System). Weather conditions are crucial for application: do not apply if frost is forecast within 24 hours, in wet conditions or when the temperature is either below 5 degrees or above 30 degrees Celsius.
Ensure application tools are clean
Clearly mask and protect unrendered areas
Ensure all substrates are dry before application
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