Gunk BTP6 Battery Terminal Protector - 6 oz. GUNK is a local family owned company based out of Charlotte, NC. For more than 75 years, GUNK products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation. Prevents battery acid corrosion Reduces battery maintenance Ensures maximum charging and starting current Provides a special protective coating