Radiator Stop Leak products are somewhat debated as to their effectiveness, or whether they’re worth using at all. Although they generally are able to temporarily stop a leak in some cars, they’re not a long term solution as they can cause more issues further down the line by clogging up engine systems. Some people do use these products without any issue, however, and it's worth knowing which the best are in the event that you need a stop gap measure.
We've chosen the best radiator stop leak products in 2022 that are well-rated for their effectiveness, and have been around long enough to note any long-term issues likely to arise following their use. Each of the following products is relatively affordable and simple to use, making them good to have on hand for emergency situations.