Solder Seal

A Century of Automotive Problem-Solving

Few names in the automotive aftermarket carry a legacy as long or as authentic as Solder Seal. The brand traces its roots to 1924, when entrepreneur I.D. Blumenthal witnessed a local tinsmith fix a leaking car radiator with a remarkable powder compound. Recognizing its potential, Blumenthal partnered with the tinsmith, and Solder Seal became the very first product of what would grow into the Radiator Specialty Company — today known as RSC Chemical Solutions.

For a brand born from a single roadside repair, Solder Seal's growth into a full-spectrum automotive chemical line is a testament to the enduring value of practical, field-tested problem-solving. Over the course of a century, the company expanded far beyond radiator repair, building out product lines that address nearly every fluid, cleaning, and maintenance challenge a vehicle can present.

What Solder Seal Makes

Solder Seal's lineup spans a wide range of automotive maintenance and repair chemistry. The brand is perhaps best known for its engine cleaners and degreasers, tackling grease, grime, and oil buildup with heavy-duty formulas designed to cut through the toughest shop messes. Complementing those are dedicated parts cleaners — including brake parts cleaners and parts washer solvents — engineered to remove brake dust, fluid residue, and contaminants without leaving behind harmful residue.

The Solder Seal Gunk line extends into fuel system additives, including diesel fuel conditioners, injector cleaners, and fuel dryers — products designed to keep fuel flowing cleanly through the seasons, protect fuel filters, and maintain engine performance. The brand also offers transmission fluids and power steering fluids formulated to meet the demands of late-model OEM vehicles, along with a range of gasket and joint sealing compounds that echo the brand's original sealing heritage.

Beyond liquids, Solder Seal's portfolio includes lubricants, greases, and anti-seize compounds suited for brake calipers, chassis components, and general shop use — rounding out a lineup that covers nearly every fluid-based maintenance need in the shop or driveway.

Made in the USA, Trusted Worldwide

Solder Seal is manufactured by RSC Chemical Solutions, a privately held company headquartered in the Charlotte, North Carolina area. RSC's production facility is ISO 9001 certified and operates multiple high-speed production lines capable of supporting automotive, hardware, marine, and industrial markets. With distribution reaching more than 1,600 customers across 81 countries, Solder Seal products are a trusted solution well beyond American shores.

RSC's portfolio of trademarked brands — including Gunk, Liquid Wrench, and Titeseal alongside Solder Seal — reflects a company that has consistently expanded by acquiring and developing product lines that serve real hands-on needs. Whether you're a professional technician maintaining a fleet or a DIY enthusiast keeping a daily driver in top condition, Solder Seal's long track record in automotive chemistry makes it a reliable go-to for maintenance and repair chemicals.

Why Solder Seal Endures

What keeps a brand relevant for a hundred years? In Solder Seal's case, it's a commitment to formulas that actually work under real-world shop conditions — products developed not in a vacuum, but in response to the specific, recurring challenges that automotive maintenance presents. From stopping a stubborn radiator leak to breaking down baked-on engine grease, Solder Seal has built its reputation one successful repair at a time.