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Silicone caulk generally cures within 24 hours. If it has been over 24 hours, check the silicone caulk Use By date on the package. If the product is older than the Use by date printed on the product, safely dispose of the product.It is too old and will not cure.ilicone caulk generally cures within 24 hours. If it has been over 24 hours, check the silicone caulk Use By date on the package. If the product is older than the Use by date printed on the product, safely dispose of the product.
All I can say is that it worked incredibly well for me when I was re-caulking my bathroom. I don't know whether the old caulk was silicone or latex, but after spraying it and letting it sit for around 20-30 minutes, it all pretty much turned to jelly and came off very easily with a caulk tool.