LA-CO Heat-Seal Stik, a sub-brand of JB Industries since its inception in 1967, has been proudly made in the USA. Specifically designed for quick, effective repairs, Heat-Seal Stik seals small holes and cracks in refrigeration units and metal surfaces, providing an immediate fix—even if a longer-term solution is eventually needed. Unlike epoxy compounds, Heat-Seal Stik requires no mixing and activates with heat, forming a durable, high-temperature-resistant seal that makes it ideal for sealing leaks in refrigerant lines and other demanding applications.