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.
Beeswax?
Food grade silicon.
http://forum.beemaster.com/index.php/topic,44177.msg380821.html#msg380821 (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