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Craig,Our experience with Fix-a-Leak is all of the above. For some it is a band aid. For some it seems to work as a longer solution. for some it doesn't help at all.I look at it as an inexpensive attempt before investing in a more expensive solution.
The leak fixing products act more like a plug, not a glue. They don't work very well on leaks due to cracks. The reason is that when the pipe is pressurized, it will flex and just open up any seal that was made. Now leaking glue joints are another story...it works quite well there.
Thanks for your help everybody. It sounds like I need to replace the manifold. When I do, I am positive some of the tubing going into it is going to crack (as I mentioned its somewhat brittle feeling). Is there a way to splice tubing or I am I going to have to run all new tubing as well.Thanks again, --Craig