The Sealant Saver was developed by a cabinet maker to prevent caulking tubes from drying out. Simply fill the tube with water and place open caulking tube down into the Sealant Saver tube. The Sealant Saver creates an air tight seal that prevents caulk or silicones from drying out. It easily mounts with screws to any surface.
What about polyurethane based sealants or glues? Wouldn’t that cure in the water?
Yes, it would. You could try using something like mineral spirits instead of water which may not cure it but accomplish the same goal!
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Response: So long as a tube is inserted, the water should be sealed in there and not evaporate. When caulking is in use and the water is open to the air however, it will slowly evaporate. The rate at which it evaporates will depend upon the external environment it is in. The tube when filled needs about 1 teaspoon (5ml) of water to function properly.