Thanks , Mike. I wondered about drinking anything hot out of epoxy? Like Toxicity??.
My plan on the nest one is to seal the bottom from the outside with a thinned epoxy coat to penetrate the pores from the outside in. Those fibers are like straws and really open up when heated. I have oiled this one so much that I don't think epoxy would hold to it now.
This one held cold beer okay just as it is.

Cheers, Jim ........................ Variety is the spice of life...............Learn something new every day