"My watering can was starting to leak, and I thought I would have to get a new one. My sister suggested I use silicone tub and tile caulking around the spout where it was leaking. It worked great! It no longer leaks, and I won't have to buy a new watering can just yet!"
I am betting tub caulk can fix other leaky things as well.
Check out Betsy Bargain's Talk Thrifty to Me blog.