sealant for oak barrel fountain?
 

I have a couple of oak barrel fountains and I have inserted the molded
plastic liners to keep them from leaking. These work great, but I
don't like the way look, I would like to find a flexible sealant that I
can brush or spray on the inside of the barrel. There is a catch; I
would also like to be able to put fish in the fountain, so nothing
toxic.

Anyone have any ideas?

Thanks!
Steve

how ironic, that natural way is toxic ;)
Thanks for the information, I never thought about the taninsbeing a
problem. I will also check into a possible additive to neutralize the
acid, may or may not exist, but worth a check.

I would still be interested if anyone knows of a specific product that
is non-toxic.

Have a good day and thanks for the response!
Steve