Metallic Seal Up 7.5 Oz Radiator Stop Leak - For Heater Cores, Head Gaskets, Engine Blocks

About This Product

Got a small coolant leak you need to fix without tearing apart the whole engine? Metallic Seal Up (part number 3003) is a trusted stop-leak formula that can help. This 7.5-ounce bottle is designed to seal leaks in radiators, heater cores, freeze plugs, head gaskets (they recommend two bottles for head gasket leaks), engine blocks, and cylinders. It's compatible with all types of antifreeze and is water-based, so it doesn't contain harsh sodium silicate (aka 'liquid glass') that can clog up your system. You just pour it into the radiator or coolant reservoir, run the engine to let it circulate, and it goes to work sealing small cracks and gaps from the inside. It's meant to seal leaks for 2 years or longer, and you can leave it in the system for ongoing protection. The best part? No need to drain or flush your cooling system beforehand. Of course, this is for minor leaks – if you've got a major rupture, you'll still need mechanical repair. But for seeping seams, small cracks, or weeping gaskets, it's a cost-effective, easy first step. Keep your cooling system sealed and your engine running cool. A must-have for any emergency car kit or garage shelf.