Well, I heard things of water leaking through.. You could use some "maizena" *that's what it's called in Dutch, I don't know if it's the same in English*. Maizena is a powder and if you mix a bit up with water the water becomes a bit thicker in density.. I've tried it once, works fine... Just been in it for 3 weeks, no problems YET. I'm not telling you it will work but it works fine for me to this point.