The two benefits of the Metal to Metal, to me, over the fiberglass filler, are 1. it sands easier after it sets up (sanding on the fiberglass after it sets up is like sanding on concrete), and 2. it will take heat so it is OK on engine components. The one thing I don't like about it and someone mentioned this, is that the catalyst is clear and you can't tell you've mixed it into the paste well.
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