I went to Michaels and got a thin black sheet of adhesive foam and this is the final product. It has also been in the water as well. Let me know what you all think?
Looks good to me. I would have rather you used some kind of Felt material but this will probably work just fine.
If the foam does not work out over the long haul and you can't find proper Felt I can vouch for this rubber. It is thin and strong but does have that weird Chinese rubber smell that take a few days left outside in the sun to disappear.
This stuff is also great for making gaskets to stop leaks.