Radiator Specialty Co Radiator Leak Sealant
About Radiator Specialty Company (RSC)
Radiator Specialty Company, now operating as RSC Chemical Solutions, has been a cornerstone of the automotive chemical industry since its founding in 1924. The company got its start when I.D. Blumenthal began selling a product called Solder Seal to repair leaking car radiators — a humble origin that grew into one of North America's most recognized names in automotive maintenance chemistry.
Today, Radiator Specialty Co. develops and markets hundreds of products under well-known sub-brands including Gunk®, Liquid Wrench®, TiteSeal®, and Engine Brite®. These brands collectively cover an enormous range of vehicle care needs — from heavy-duty engine degreasing and rust-busting penetrants to fluid additives and radiator repair. The company serves more than 1,600 customers across 81 countries and operates out of a 400,000-square-foot ISO 9001-certified manufacturing facility in Indian Trail, North Carolina.
What Sets RSC Apart
RSC's longevity in the industry is no accident. The company invests in continuous research and development, and its manufacturing facility runs eight state-of-the-art production lines with an SAP Operating System — infrastructure that supports the quality consistency that both DIY enthusiasts and professional mechanics rely on. Their products are designed to tackle real-world automotive problems: seized fasteners, sludge-laden engines, leaking cooling systems, and worn drivetrain components.
For drivers looking to extend the life of their automatic or manual gearbox, RSC's Automatic and Manual Transmission Fluid Additives are formulated to reduce friction, prevent wear, and restore smooth shifting in aging transmissions. Similarly, the brand's Engine Oil Additives are engineered to help reduce engine wear and keep oil performing effectively between changes — particularly useful in high-mileage vehicles.
One of RSC's most iconic product lines lives under the Liquid Wrench brand. Their Penetrating Oils are legendary for dissolving rust, cutting through grease, and freeing stuck nuts, bolts, and hardware that refuse to budge. Whether you're working on an exhaust manifold or a seized suspension component, a quality penetrating oil is an indispensable shop staple.
RSC also has deep roots in radiator and cooling system care — a nod to the company's original mission. Their Cooling System Leak Sealants provide a fast, practical solution for minor leaks before they become major repairs. Rounding out the fluid care lineup, the brand's Power Steering Fluid Additives help combat common issues like pump whine, hard steering, and seal leaks in aging power steering systems.
A Brand Built on Practical Problem-Solving
From the backyard mechanic to the professional shop, Radiator Specialty Co. has always focused on practical, accessible chemical solutions. Their products are widely available through automotive aftermarket retailers, hardware stores, and industrial suppliers — reflecting a brand philosophy centered on getting the right chemistry into the hands of anyone who needs it.