The 5200 cures very slowly, can take a week or more at lower than ideal temps and even longer in cold conditions. Especially if you bought the regular vs. the "fast curing" version...
It should harden to a consistency similar to that of cured silicone - not rock hard but not mushy either. For thicker layers I would allow extra time to cure as I am guessing the curing process is activated by air contact and it will take longer for air to get through to the inside of a fat layer of the goop...
Wabakimi Canoe Pack
Touring Kayak Paddles
Full Size Sail Rig
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