Many big-name guitar makers say they use Franklin Titebond 50 for gluing. After some poking around on the Franklin site I finally found info on it, but it seems impossible to find for sale. Is this only sold in 40-gallon drums or something? I was planning on experimenting with a few different glues for instruments (hide glue, Titebond Original, etc.) but I might have to scratch this one of the list.