After asking about the use of "Jell-O" (gelatin) as glue I found
that there are a couple of pages related to hide glue and gelatin on
a guitar building site.  This site deals specifically with the use of
un-flavored gelatin as an adhesive:
  http://www.frets.com/FRETSPages/Luthier/TipsTricks/KitchenGlue/kitchenglue.html

These sites refer more generally to the use of hide glue in guitar
construction.  There is a reference to the Player Care web site for
more information, so "they" are watching us as well:
  http://www.frets.com/FRETSPages/Luthier/Technique/Glue/UseHideGlue/usehideglue1.html
and
  http://www.frets.com/FRETSPages/Luthier/Data/Materials/hideglue.html

Wallace Venable