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Sikasil Ws-305s High Performance Silicone Weatherproofing Sealant. High Elasticity: Features 600% elongation at break for superior flexibility and durability. Structural Bonding: Provides strong structural adhesive properties for automobiles and construction. Neutral Cure: Moisture-curing neutral silicone ensures no corrosion or damage to substrates. Non-Sag Performance: Excellent non-sag properties ensure precise application on vertical surfaces. Fast Tack-Free: Achieves tack-free status in just 140 minutes for efficient workflow.