Add Yahoo as a preferred source to see more of our stories on Google. Man's hands applying caulk - Yori Meirizan/Getty Images Don't let a gunked-up caulk gun ruin your home improvement projects.

Whether it is to seal windows, weatherproof your roof, or make your bathroom tiles fit together perfectly, there are plenty of reasons why a caulking gun belongs in your tool box. These days, there ...

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