Silicone seal is water vapor cured. Below 32 degrees there isn't a lot of local humidity to begin the cure. Warm it up above ambient and it will be fine but a slower cure. I myself use a 100 watt incandescent heat bulb typically out of a bathroom.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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