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I have had that happen with GE Silicone but the tube of caulk was opened and was several months old. I have never experienced it since. This was almost 20 years ago and I was using it on a bath tub drain. I will throw away any leftover material if I can't use it within a couple days. For the car I use the RTV silicone by pematex, many types and colors availible. Check the auto parts store.
John
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