A Silicone-Based Lubricant/Sealant Formulated For Use Under The Most Adverse Conditions. Formulated to be corrosion free on many materials including rubber and in the most adverse conditions such as salt water. Safety is also an important factor so, our formulas had to be very special for your safety and for the safety of the environment! Magic Lube® and Magic Lube® II have received an environmental safety rating of H-1 by the USDA. “The Only USDA H-1 Rated Lubes”