Irontite All Weather Seal, Blue, 16 oz

I am-one of the lucky people who happens to own a truck wiith one of those millions of pairs of cracked heads on vortec engines of certain years.At 100000 miles, I am in no mood to purchase and install new cylinder heads, l heard of this product on one of the automotive shows on Motor Trend tv. Product is high priced, but beats the alternative, as this stuff really worked-no more unexplained low coolant levels. If used , you must drive at higher speeds/rpms right after pour. So far, so good.

This stuff really works.I am very skeptical about additives in general,so when I heard about this product I really didn't expect the results I got.I was hoping this was going to prove me wrong and it did.I had a small antifreeze leak that I couldn't even find the source on my 2002 for taurus.I had changed the water pump about 6 months prior and this small leak kept showing up on the floor of the garage.I power washed the motor and still with mirrors etc. I could not find the source.I was told about this product and it worked.No more leaks and I didn't have to pull the water pump again.Ps. All hoses and clamps were find so it may have been sweating out from one of the bolts that secure the pump,but this did it.

This item came quickly. I flushed another type of sealer out of my heater core that had it clogged I used irontite flush worked great,but then the heater core leaked really bad, put in irontite sealer stopped the leak in 5 minutes and still have heat.... Great product!!!

Worked good.

I ordered this on a recommendation. 06 Jeep, 200+ miles, not replacing radiator for worn seals. I bought this stuff, introduced it into my system. First 24 hrs, the cooling system puked fluid on the cool down. Needless to say, not hopeful!. Drove it to work with lots of coolant to spare... 4 weeks, not one leak. I have had no issues on cooling system flow. I have used other products without the same results. I can say, the entire 3 step process is going to be applied to my other running vehicles, but, for a fix..... this one product was fantastic. I did seal a leak seal w/in a couple minutes.. the final seal took a couple days of driving. My leaks were the seals between the various plastic/metal parts on the radiator that Chrysler (Mercedes) elected to use. I really believe the engineers need to understand how to work on cars, and actually experience end user issues. (FYI, I was an engineer, build cars in my free time...

Didn't do anything for me. I'm an ASE certified mechanic. Had a customer come in with a small coolant leak at the water pump on a 2000 Chevy Cavalier. After he found out that it would be $750 to fix it properly, he wanted to try one of the stop leaks. He saw this one on the Truck U, TV show, and wanted to give it a try. Followed the directions, and I don't think it did anything to stop the leak. It truly is a shame, because I think he just scrapped the car, because it's not worth such a major and expensive fix. It was such a small drip of a leak that I hoped this would work, but no such luck.

Put this in radiator of car. Time will tell if it works - hope it does.

A+, I'm not really a believer in these type of products. I had a older jeep that head a heater core smell, not really badly leaking but the interior clearly smelled a faint trace of burning engine coolant. I added this stuff and the smell went away, probably saved me $600 - $800 of a auto shop bill, so for me 5 stars !!! - long term, who knows but for me a short term interim solution. as far as I know that car is still running well with no issues. for a largerleak who knows, and based on the reviews some say OK some say NO. so for the money why not try ?