Many consider Berryman Products to be one of the best-kept not-so-secret secrets in automotive additives, and we'd have to agree. The company's fuel additives, especially its B-12 Chemtool Fuel Treatment, are well-lauded for doing exactly what they promise to do: improve the performance of your fuel system's components by cleaning them with Berryman's own H.E.S.T. (High Energy Solvent Technology). Berryman also manufactures octane boosters, parts cleaners, and even a handy product called Tire Seal-R, which as the name implies, repairs tires with a permanent seal. Tire Seal-R (originally named Sealex Tire Sealer) is actually the product that put Berryman on the map in the automotive world, as it was Berryman's first product way back in 1919.