I have a CE4 that began to show slight cracks after 1 week and slow leak a couple days later. Being frugal, I didn't just want to toss it so I washed it and let it dry overnight then I took some clear fingernail polish and gave it a coat around the bottom where it was cracked/leaking and let it dry for several hours to let it set up good. Refilled and it is working like new and no more leaking.