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I think what jex meant was that the temperature swings cause a lot of expansion and contraction, and the silicone weakens eventually. I think brittle is a good way to describe it when it hardens, begins peeling and fraying off in chunks.Folks, the silicone does not get brittle, but I won't go into that complicated subject here. Instead I will post a new thread.
It is very bad to store an empty tank outdoors and there I will tell you why!