Question: will silicone stick to silicone?
Answer: No, your new caulk won't stick to silicone caulk. Sorry to be so abrupt, but it's the truth. ... Fact is: nothing will stick to silicone - not even silicone. For the average person who needs to re-caulk their windows, bathtub, or anything else around the house, failed silicone means starting over from the very beginning.