9900 Waterproof Sealant is made of neutral silicone, boasting stable viscosity (180000-200000 mPa·s) and strong shear strength to ensure, long-term sealing performance. Waterproof Silicone Sealant long-lasting weather and water resistance, performing reliably between -10°C and 45°C while maintaining consistent elastic sealing and stain-resistant properties. Silicon Waterproof Sealant 9900 has a 1-year shelf life; for optimal results, apply only to clean, dry bonding surfaces and use before the expiration date. 9900 Sealant Waterproof high-strength adhesion with stable physical properties-optimal hardness and 300% elongation-creating a firm that fits diverse indoor and outdoor sealing scenarios. Silicone Waterproof Sealant 9900 meets premium environmental standards, featuring a low-odor, impurity-free formula that adapts seamlessly to both indoor and outdoor construction environments., Weight: 1.653466965 Pounds, Manufacturer: Goutdori_F41_8142456