Silicone sealant not cured


Hi,
last evening (6-30ish) I sealed the sides of a timber window frame in readiness for painting. I used silicone sealant. I then covered the entire window with polythene to protect it from the (correctly) forecast overnight rain.
This morning I took off the polythene and the silicone sealant is still very much 'wet'. The question is, will the silicone cure/dry or have I allowed it to become too damp?
TIA
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Proper silicone sealant cures in the presence of moisture giving off acetic acid (unless its the non corrosive stuff). Are you sure its not non-silicone sealant (acylic ?) as I have had some old tubes of acylic sealant (10years + old) that were still fluid but never set.
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