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Yea, I was referring to the Bottle, and I think the Blue Bottle is the stronger stuff. Thanks for the clarification.
I started using the stronger stuff after I had a 460 that I did for a Tree guy spit the muffler bolts 3 times in a month. They were super tight, with the regular Loctite, and it kept spitting them! The Heavy Duty stuff cured the problem.
I use ultra copper RTV on the threads of exhaust bolts. For high temps it works better. It's an old trick to keep header bolts from rattling out on race cars.