Valco HV-350 Sealant/Adhesive. 3.35 oz. HV-350 is a one-part, multi-purpose adhesive that virtually outperforms any glue, epoxy or silicone on the market. The “HV” stands for high vibration. Due to its tremendous elasticity, HV-350 is ideal for high-vibration applications. HV-350 can be stretched up to 600 percent of its original length. Maximum temperature is 230 degrees Fahrenheit. Use HV-350 to adhere mats, repair fiberglass, mend rips in wet suits, waterproof electrical components, attach plastic and carbon fiber parts and much more. Unlike silicone, HV-350 can be sanded and then painted with either oil-based or water-based paints. It is also abrasive-resistant and flexible, allowing use on high-wear surfaces. This glue is used almost anywhere, from highly porous surfaces such as cinder blocks to nonporous surfaces such as metal and glass. 12 per case.