Selleys N-Mastic - Non-Hardening Polybutene Sealant 410g

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Get a strong and flexible bond with Selleys N-Mastic from our flexible gap filler range. Perfect for sealing gaps and joints in your surfaces. This non-hardening, polybutene-based compound remains permanently soft and paste-like, providing excellent adhesion to glass, masonry, metals, expanded foam panels, timber, and plastics. Features moisture resistance, low shrinkage, and a wide service temperature range from -40°C to +80°C.