In reference to John Tuttle's question about removing hot melt glue
from wood, I wonder if extreme heat would help. Wood starts to burn
at roughly 500 degrees (Fahrenheit) and hot melt glue melts at about
200 to 250 degrees. At slightly hotter that 250 degrees hot melt glue
gets very liquid. So, if you were to bake the wood, slightly elevated,
with the glue side down, at something under the burning temperature of
wood, I wonder if the glue couldn't be just baked out?
I couldn't find an internet reference on the burring temperature of
hot melt glue, but perhaps if the temperature isn't too close to the
burning temperature of wood, maybe the hot melt glue could be burned
out of the wood after most of it melted away. There would be some
"glue ash" and almost certainly there would be some discoloration but
some light sanding may fix that.
I haven't tried these, they are only suggestions that I hope may be
useful. I look forward to hearing about John Tuttle's successes in
the eradication of hot melt glue from wood.
Albuquerque, New Mexico, USA