Like I just said above, I'm working on this old Dodge Van and every.single.time I go to AutoZone and I see that $45 bottle of "Coolant System Sealant and Refrigerant," I almost buy it. But I never do because I've convinced myself it's the same thing as lighting $45 on fire.
I said the same thing about the $10 bottle of Lucas oil power steering sealant. I had an old Toyota that was just pouring power steering fluid out of the rack. I gambled $10 on it and it didn't leak a drop for another 100,000 miles