Just as a followup post in case anyone ever references this thread in the future.
The clear silicone that I used to repair my sump with (that begat this whole thread in the first place), was "All Glass Aquarium" brand.
It yellowed within a week (below the water line). In my case, it's a sump, so aesthetics aren't all THAT important, but I was still quite disappointed with that. I've now done two sumps with two different silicones, Silicone I (clear) and All-Glass-Aquarium (clear), and in both cases have had yellowing of the silicone below the water line. You do not want to use these products for anything that will end up being a display where looks are important. My advice is, go the extra distance and find the GE1200, GE RVT100 or GE IS800 silicones.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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