Let it sit a couple of days and it will set up. Sillicone sets up slow when you fill a crack 1/4" or bigger. I don't where you got the silicone but the best bet if your using it as grout is to go a tile shop and they will give the right stuff.
All silicones are not the same. Be patient and good luck.
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Wally and Phyllis
1988 Newell Coach #163
40' with tag 8V92
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