Hide glue softens with heat.
Don't know about fish glue.
Wheat paste?

Art

"hylourgos" wrote in message
ups.com...
Well darn, that was so obvious, why didn't I think of that? Hide glue
(which is just protein, I think) might work fine too, but fish glue for
fish plank...why oh why was my first inclination towards the most toxic
glue?

Now the only question is whether it will hold up under moderate heat.

Thanks for whacking me upside the head,
H