This is what I used to seal my glass up.
http://www.permatex.com/products/Aut...ass_Sealer.htm
low/no odor.
It's slightly more runny then regular silicone so it is able to flow into the crack between the wood and glass to make for a good seal. It's not so runny that it goes everywhere and makes a big mess though.
I ran a small bead around the inside of the humidor and let it sit over night.
The key to making it work and look nice is just cutting a small hole in the nozzle, take your time and try to have a steady hand.
This stuff worked great for me.