Caulk tube has not been used, has stayed in garage about 6 months anyway to soften this
There is no effective long term way to store tubes of silicon. Even unopened tubes have a finite shelf life. I have found the most effective way to store opened tubes for medium lenght time, is to allow a bit of excess to flow over the tip, and allow it to form a plug. In a few months, this plug may extend the full length of the nozzle, but you can push this out with a piece of steel rod (from the tip end). I keep my tubes of silicone and caulking in a cool dry place. I've never tried the bucket of water method, so I don't know how successful that would be.
You may not be able to use it anymore. You'll have to buy a new one. Personally I didn't face with such problems, but maybe someone here will help you. I can only recommend to check out the post right here, you will find a lot of caulking tips and tricks! Good luck!
I typically try not to keep things like caulking in the freezer/frig. Having said that...i have put paint brushes that have latex paint on them in the freezer for a day or two in between doing coats of paint. Just wrap them in plastic wrap like Saran wrap then put them in the freezer. That'a only temporary whenpainting a room. That's much easier than cleaning them after each use over a couple days of painting.
For caulking, i usually find a long screw that fits snugly and deeply in the spout, like a 2" or 3" screw. I let it dry in there and then when I need to use the caulking again, I pull the screw out which pulls out the plug.
If the caulking is 2 years old, it's probably going to be dried up.
I have had good success with keeping silicone in the fridge.
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