Best Radiator Sealers in 2022

Last update: December 18, 2022

Bardahl 2117 No Smoke + StopLeak - 16 fl. oz. Review:

I enjoyed it. It succeeded. My 2006 Honda Pilot and 2000 Camry both leaked. Every four weeks, I poured 1/4 of the bottle to prevent oil thickness from damaging the engine's pressure system. I am aware that it is only a short-term remedy, but I'd rather spend $10 on a car that is over ten years old than thousands of dollars.

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams Review:

worked flawlessly when doing a task for which it was not intended. My boat's water tank developed a significant leak, but I still planned to use it for the remainder of the season and replace it once we pulled it out of the water. I utilised your stop leak to stop or slow the leak(s) so I could have water for the head because I wanted to go sailing for a week or two before that. I am aware that after application, you cannot drink the water, but I don't mind. Water in bottles, baby!The leak significantly decreased after the first application, and it completely disappeared after the second.a good product.

AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g Review:

We've been using this product for decades, and it seals leaking heater cores, timing covers, and radiators like magic. This can save your life, but only if the leak is severe enough that you need to repair the gaskets/hoses, wherever they may be. Thanks to Alumaseal, the heater core on my 1990 Ford is still in place.

Irontite All Weather Seal, Blue, 16 oz Review:

On the basis of a referral, I bought this. 200 miles on a 2006 Jeep; seals on radiator not replaced. I purchased this and added it to my diet. The cooling system puked fluid throughout the first 24 hours of the cool down. Needless to say, I'm not optimistic. 4 weeks, not a single leak; drove it to work with plenty of coolant to spare. My cooling system flow has never been a problem. Other products I've used haven't produced the same outcomes. I can confirm that the complete three-step procedure will be used on my other running vehicles, but for a fix, this one product was outstanding. I was able to stop a leak in a matter of minutes, but it took many days of driving to complete the seal. My leaks were caused by the seals that Chrysler (Mercedes) chose to employ on the radiator's different plastic and metal components. I firmly believe that engineers must have a working knowledge of automobiles and must have firsthand experience with customer complaints. (Just so you know, I used to construct vehicles in my spare time.

BlueDevil Radiator & Block Sealer Review:

I had a crack in an SBC 350 that I found in a junkyard (just behind the push-rods). I was loading my 1936 Pontiac with it. When I first noticed the lump in the cast, I thought it was a casting flaw, but my mechanic was correct, and I was losing coolant into my oil. I bored a hole in the thermostat and poured this in after flushing the radiator with water. I then let the car to idle for the recommended hour before letting it cool over night. The radiator was still filled with blue fluid when I stepped outside the following morning (I couldn't believe it! ), and the oil gauge was dead. haven't had an issue since! BlueDevil, many thanks

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz. Review:

Although it makes your coolant appear like dirt, I use it for all older automobiles I work on to repair cooling systems. As it contains oil, I think this is excellent for preventative maintenance, especially on overused systems that may have rust.The block had some rust due to using water to help it along and then taking a few weeks to finish the process, so I installed it in an old S-10 after changing the head gaskets. Since then, I've had no issues with overheating. A few days later, as the car was idle, I noticed a tiny drop coming from the radiator. I haven't had to add water or replace the radiator yet, even after several months. Although I wouldn't rely on it to repair a head gasket, I heartily endorse using it to stop little leaks and as a preventative measure.