The vast majority of modern guitar joinery techniques employ PVA (polyvinyl acetate), an "advance" of science from the 20th century, that was created to minimize manufacturing time and limit skill requirements, effectively increasing manufacturing efficiencies. Prior to its advent, and for a period dating back thousands of years, animal or "hide" glue was the preferred material for joining wood in furniture, art and industry.
In 2013, Gibson Custom is ushering back the use of hide glue in its crafting of Historic Series instruments. This truly ancient process requires more time to be taken in the crafting of each guitar as well as more curing time to allow proper drying and adhesion. The result is a better join of hardwoods that prepares each guitar for a lifetime of use, care and recuperation from damage. The 2013 Gibson Custom Historic series now feature authentic hide glue at the neck joint, applied by hand by the world's finest craftspeople.