Has anyone tried Blue Devil Rear Main Seal Stop Leak?

cruiser said
Looks like the rear main seal on my 225 slant is bad, and my understanding is that the engine must be removed to fix it. YouTube has a number of videos of guys using Blue Devil rear main seal stop leak, and most reviews are pretty good. Has anyone on this forum ever used this stuff on a slant six? Did it work? For how long? Will it screw up your engine in the long run? Any and all please weigh in with your opinion. Slant Six Dan, if you're out there, what do you think? If you listen to the YouTube reviews, the stuff seems like a miracle cure - almost too good to be true. Thoughts anyone?

I seen, a slant six drip oil while it was on from the rear main seal, we used blue devil oil stop not rear main seal one. Poured it in let it idle for an hour it was now pissing it out you could tell it was the additive cause difference in color, 30 miles later, there is no leak at all.

I knew a mechanic who would pour a quarter of that stuff in his rebuilt motors, and also the bars leak coolant one just a little for that cheap insurance. lol