Although skeptical at first, many customers who leave positive reviews are surprised at how well the K-Seal ST5501 works on their radiator. The K-Seal ST5501 is currently Amazon’s number one bestseller for cooling system additives. Key FeaturesĪmazon Review Score : 4.2 out of 5 based on over 4,000 ratings No flushing or draining is required with this stop leak since it works with all types of antifreeze. One notable feature of the K-Seal ST5501 – it can be applied to a hot or cold engine to save time on repairs, although customers should exercise extreme care around hot engines. While some radiator sealers may only repair, this product’s advanced formula actually rejuvenates rubber seals and gaskets to improve their health, too. K-Seal ST5501 is safe on radiators, water pump casings, freeze plugs, and even heater cores. Some of the few complaints note clogging in their radiator after using this product. Many customers highlight the longevity of their radiator repairs done with Liquid Aluminum, claiming a one-time use lasts more than three months. Key FeaturesĪmazon Review Score : 4.3 out of 5 based on over 2,000 ratingsīar’s Leaks Liquid Aluminum has a great reputation with around 80 percent of reviewers leaving a rating of 4 stars or higher. While other stop leaks can take hours to work, the Liquid Aluminum shows results within 20 minutes of use and can be re-applied as necessary without damaging your radiator. This stop leak also blocks freeze plug leaks and is safe to use with both silicate and non-silicate antifreeze of any color. It lowers the water temperature in a car’s coolant system to create a safe environment for your radiator to function properly. They are the easiest of the three to apply thanks to their pour-and-go design and usually offer a very reliable seal.īar’s Leaks Liquid Aluminum radiator sealant repairs gasket and heater core leaks using its Xtreme Cool formula. Liquid stop leaks are considered the most effective due to their solubility. Although more effective than powders, solutions in tablet form do not always have great sealing properties. Stop leak tablets can either be added straight into the radiator or diluted with water and poured in. It’s an easy solution, but may be less effective since adding too much can clog the radiator entirely while applying too little can have no effect. Powders are generally applied directly to the radiator. There are a few different types of radiator stop leaks, such as powders, tablets, and liquids. Although radiator stop leak is not a permanent solution, these additives target common issues that can be maintained until proper repairs are made. It uses ceramic fibers and sodium silicate that coagulate to fill small cracks while also preventing future leaks. Radiator stop leak is an additive designed to seal leaks in a radiator that forms over time. Not sure what a radiator stop leak does to help your engine? Check out our buyers guide below to learn its essential functions and the different types you can apply. For more information on our testing methodology and how we evaluate every product, check out our methodology page here. When testing is not feasible, however, our aim is to make your life easier by doing all the online research for you and presenting that research in the form of easy-to-read product comparisons and buyers guides, rather than outright recommendations. We try to perform in-house testing on real vehicles whenever possible before making our recommendations. Our team of writers, editors, researchers, and product experts collaborates to thoroughly vet top products. Since 2020, we have published over 200 auto product reviews in an effort to make shopping for auto products easier. We looked at factors such as standout customer reviews, prices, meaningful superlatives, and discount shipping eligibility. We also factored in the quantity and quality of online retailer reviews from websites such as Amazon, RealTruck, Advance Auto Parts, and more. We pay particularly close attention to quality reviews and recommendations that highlight the quality of warranties, customer service support, build quality, materials, and overall reliability. To select the five best radiator stop leaks featured in this buyers guide, our team first combed through dozens of resources such as DIY mechanic and auto enthusiast forums, manufacturer and radiator stop leak-specific websites, instruction manuals from manufacturers, and reviews from online retailers.
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