Soudal Airtight Window and Door Installation Foam - Gun

Airtight premium quality polyurethane expanding foam filler for use around windows & doors. Superior thermal and acoustic insulation properties. Totally airtight after curing. The product is highly flexible once cured, based on FLEXIFOAM® technology, which gives improved durability. Single componen
GlassParts - Glass Fittings & Tools for the Trade

You are looking for a PU foam that is more flexible than standard

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Soudal Airtight