Blue Magic 1116 Liquid Glass Metallic Seal-Up - 22.8 oz.

If you follow the directions to the letter it works!! Sealed my head gasket leak on a 99 Accord. My rough idle went away and misfires. The subframe rusted through before the head gasket sealer stopped working. I would buy this again and again. Excellent bandaid.

I had a horrible block leak (Losing a gallon an hour roughly and steaming like crazy out the exhaust) and had quoted 4k dollar engine swaps. I tried this and a "less be-all-end-all" product to fix my truck. The K-Seal product didn't really seem to seal it up. I dumped a bottle of this in and it has seemed to do the trick. Around the 18 minute mark of the 20 minute bake time that it calls for i think it locked up my thermostat and the engine began getting dangerously hot like the thermostat wasn't opening up, so you may want to keep an eye and keep a replacement thermostat on hand if you're using this product. Following the instructions and replacing the thermostat after observing that behaviour this 4.7L Tundra Motor with 300K+ miles is back in action.

Got the job done and great value... sealed the head gaskets...car is running Smoothly better than before...my 92 year old told me about it he used it for many years when he worked on his cars... highly Recommend it

Everybody says follow the directions exactly. They start out with using the correct size of seal up product. Part number so sbd so for up to 6 gallon capacity and another part number for over 6 gallons but the part number for the bottle in my hand is nowhere on it. So how did you all figure you followed the directions without asking amazon what the part number was for the bottle they shipped. I'm guessing it's the smaller but why would I want to have to guess at this. ? The directions are crap along with the no help to find the product number . I hope it works using the bottle I got . It's a smaller car so I'm hoping avd wishing . Have had success in the past using different product so I think it's possible to work. I sure hope so. We have a blown head gasket and the car is hard to start and dies while sitting still at intersections . Then if it does start, it dies soon as you put it in gear Then line of traffic builds of honking cars. I can't stand to drive it anymore or afford to have it fixed for nearly a thousand dollars. All becatse an electric fan failed after 14 years. . It overheated very badly and caused this condition. So I'll write a better review if it works and be overall happy . But right now I'm undecided until it works

Please follow instructions, remove thermostat, remove all coolant, mix seal up with water run car for 1 hour preferably run for 5 heat up cool down cycles. Drain let sit overnight. Get all seal up out drain and fill with water multiple times until completely clear. Fill with coolant. If you have a particular cylinder that you get an OBD II misfire on , remove spark plug and disconnect fuel injector to that cylinder. Worked good for me. Hope this works for you. get all seal up out drain and fill with water multiple times until completely clear. Do not use if you see coolant in oil, will destroy engine. This product becomes solid when mixed with coolant or oil, good idea to remove lower radiator house to make sure no coolant is trapped.

I have a 2000 3.0 liter V6 Ford Ranger. Dealt with a cylinder 6 misfire for years intermittently. Of course I started throwing parts at it. Coil pack, spark plug, spark plugs wires, fuel injectors. Nothing worked. Finally noticed a color difference on cylinder 6 spark plug. Coolant leaking. Tried Blue Devil, worked for a day, clogged radiator. YES my coolant was clean because I know someone will say that. This stuff requires that you flush the coolant system until it runs clear water. Read the review from ArtS. That is a God send. My radiator drain wasn't working, so I had to disconnect my lower radiator hose each flush. Took 6 times to get the coolant flushed. Bottom line, put in the work and this stuff will work. I have been running for 1.5 months so far. Caution: check your engine oil first. If it looks like a milkshake, your head gasket is too far gone. Either replace the head gasket or get a new car. Also, be smarter than me. Make sure your heat is on when running the truck so you don't have to flush as much me. Good Luck!!!!

I have mixed feelings about this product. My tractor engine was overheating due to water loss and making a lot of noise. After using this sealant, the noise significantly reduced, which was a great improvement. However, the engine still overheats and continues to lose water. I'm not sure if it's due to the product or if my engine’s condition was just too far gone. For the price, it's definitely worth trying if you're facing similar issues, but keep in mind that it might not solve all problems.

My Chevy Astro with 170K miles has an intake manifold gasket leak where the engine coolant leaks out. I've tried another similar product that the instructions said that it could be added to the antifreeze solution. Yes, it worked for 10K+ miles, but the radiator eventually clogged. So after swapping out my clogged radiator with a new one, the intake manifold gasket started to leak again. So this time I purchased Seal Up and followed the instructions. The leak was gone after idling the engine for 20 minutes. I also removed the thermostat for unrestricted coolant flow during the treatment. Still working great after 1K miles and going .

I used it +20 years ago & I’m using it again that means it’s working.