What is the best way to frame a puzzle?

I completed a puzzle with my dad, and he was not happy that I was going to just break it back up and put it in the box. I am thinking of framing it and sending it to him (which will annoy my mom, but that is for another question lol). What process should I use to glue it together or shellac it before putting it in a frame? Please let me know name brands if you have a specific recommendation and where I can buy the supplies.