What to use on the inside of top feeder

[Stung]

        I want to build my own top feeders.  I know that the joints will filled glue, but what do I use to line the interior to make it water proof that won't kill the bees.

[DMLinton]

Beeswax?

[drlonzo]

Food grade silicon.

[Variable]

http://forum.beemaster.com/index.php/topic,44177.msg380821.html#msg380821

Funny I had just posted the above when I saw your post....
Just my $0.02