3M Marine Grade Silicone Sealant is designed for the harsh marine environment. Formulated as mildew and high-temperature resistant, this sealant provides a durable and long-lasting seal. This weather-resistant sealant is formulated to resist mildew and form a non-yellowing seal for above waterline applications. In addition, this marine sealant is high-temperature resistant and remains flexible even after years of exposure. The non-shrinking and non-sagging properties of this product offer simple and efficient application.