In our radiator repair shop, we would use stop leak if the situation required it. Alumaseal Corporation is an Arizona Profit filed on October 27, 1959. Prime. AlumAseal is safe and compatible with ALL antifreeze and coolants (green, orange, yellow or G-05, etc. Size: Blister Card (Single) Verified Purchase. The best head gasket sealer is the Blue Devil Permanent Repair, which fixes blown head gaskets, warped or cracked heads and a range of other defects. This would allow you to begin by using 1/3 of the bottle initially and if more product is required you can add the additional amounts. Best product I have ever found is Alumaseal. All Hello, Sign in. Put a teaspoon of ground black pepper in the radiator. AlumAseal is completely safe for all automotive cooling systems. AlumAseal® Radiator Stop Leak and Conditioner is formulated to quickly and safely stop radiator leaks. One person found this helpful. July 5, 2016, 7:09pm #2. They want $350 for a new radiator - is it safe to use the liquid radiator sealant to stop a leak? It is safe and effective for all metal, plastic and rubber parts and will not clog any part of the cooling system. It’s been the world’s best selling stop leak and is available as a powder and liquid. Then with motor running I add the mixture back in to the radiator. If you flush your system with citric acid as described in several threads and in the Mercedes service manual, then use Zerex G-05 that you can get at any parts store or ponline, you will be ok. From what I have seen, the weakest point in the system is the aluminum thermostat housing, which can be broken if not installed properly. Account & Lists Account Returns & Orders. The company's principal address is James I Stanzel 15001 N 74th St, Scottsdale, AZ 85260. Compatible transmission type: Automatic and powershift Conditions and prevents rust and lubricates water pump Safe for all metal, plastic and rubber cooling system parts Faster, stops leaks safely, quickly and easily It's compatible with all antifreeze and coolants and safe to use … Most parts stores have it. Well its been 25 days since I put the Alumaseal in and the car is still losing coolant. AlumAseal has a 75-year proven track record of fixing radiator leaks and saving car owners bundles of money. It is not a permanant fix, but will get you by. 5.0 out of 5 stars How I use AlumAseal. Hope this helps! Guaranteed to work or your money back! It's compatible with all antifreeze and coolants, and safe to use … AlumAseal(R) has been sealing radiator and heater core leaks for over 75 years. AlumaSeal 96 sealing films have one partial-width end tab with no perforations. The AlumAseal Radiator Stop Leak Powder Blister Card is quick and easy to use; simply pop it in and drive off. 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