[Tregrad]

G-Dog,
I am in the tile business and we are constantley trying to avoid water damage in showers. They have come up with a new sealant called "Butyl Rubber" its in a tube just like caulking but you cant get it at a Home Depot or anything like that, you need to go to a local tile distributer and buy a tube. the stuff never dries and always remains "stickey" so it wont crack and let water thru over time. I dont know how it will work with heat, but I dont think it will get too hot. if it does then your pc is probably already fried LOL. Silicone caluking will over time 'dry' and begin to let water in.

Hope it works.