AlumAseal ASBPI12 Radiator Stop Leak Powder Blister Card - 20 g

The product sold here is identical to the one I used over 30 years ago. I was travelling over Tioga Pass heading towards Yosemite National Park when my radiator sprung a leak. Pouring Aluma Seal Stop Leak powder into the coolant soon stopped the leak. I was able to drive to the park, and then another 200 miles the next day. No leaking at all. The product worked perfectly, so I bought it again for my latest vehicle. It's always smart to have something like this on hand just in case.

Quality product. Stocking up due to the clearance pricing. Have used this product for years. Seals those minute aggravating leaks!

Couldn't drive more than 15 minutes without having to add water to the radiator. after using this product the leak appeared to stop completely, not quite. The next day small amount of water was leaking. The leak had been significantly reduced, but not 100%. Since I was close to a Walmart I decided to stop by and buy a similar product. After adding half of that bottle, the leak stopped completely.My father in law recommended this product, but didn't tell me till after I had ordered just one, that I might need two. Maybe if I would have used a second one it would have been enough.

I was losing about a gallon of water an hour and I put this in my international tractor radiator and sealed it up, I couldn’t believe it!Highly recommend it, if you can get ahold of it

My radiator started leaking from tiny cracks where the cores meet the tank, and it's not even a year old! I figured I'd give this stuff a try before I replace the radiator for a second time this year. My expectations were quite low, but within 3 days the leak completely stopped! It's been holding for about a month now; I'll update this review if/when it starts leaking again.

Been using this stuff over 65 years when needed. Have a 96 chevy pick up with Plastic radiator in it. I was doubtful it would work in a plastic radiator worked like a charm Ove Couse this is not a permanent fix but will work till i get a new Radiator. Defiantly I will keep using this Product 100%

It works great. Leak fixed. Took 11 days to get here. 11 days. I could of crawled to the store

I tried this in my 2000 Chevrolet Monte Carlo...3.4L V6 engine. If you know anything about GM cars, you know that the 3.4L engine is a lemon. Inlet manifold gasket failed after 100k, then 10k later the head gaskets failed. I had the inlet manifold gasket changed, but I didn't want to do the job all over again for the head gaskets. So I tried this instead. So far I've driven 5k additional miles, no issues. It really worked. I noticed a definite improvement after putting it in the radiator. If it starts giving me problems again, I'll likely use another bottle.