Just a bit of clarificaiton. Barsleak has a polymer in it that are actually small particles, VERY small. they actually act in the reverse of what one would expect. when they are saturated with liquid, they shrink and are small. When exposed to air, and they "dry out" they stick together and expand. The particles in this product behave very similarly to your blood when you get a cut. They form what amounts to a polymer "scab" on the leak. As long as they stay in suspension in your coolant, they shrink and do not "clot".
Also, a little history, this product (before it became commercialized) was developed for the US Navy in WWII to fix leaks on submarine water systems. It works and worked well. coming out of WWII, the product was commercialized. It is FAR from "snake oil", but it won't fix a 1/2" wide crack in your block either. Also won't fix a blown head gasket. But it sure does fix a cracked heater core in your vehicle, or bolts not sealing in the block that open into the water jacket.
Barsleak is NOT designed to fix combustion chamber leaks. It is NOT designed to fix large holes. It will seal small cracks, poor thread sealing, and other similar issues. Using this to fix major compromises in the cooling system will just not work, nor was it what the product was designed for.
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