You're not taking about polyester bonding paste are you?
It does exactly what you're after and most Sammios are held together with the stuff! I was very impressed when i used it. Although i did notice that it's 5kg min tubs
I don't know where you are, but I'm sure I've got a bit in the garage somewhere left over from the Sammio that you can try if you're local to Somerset?
Edit: Just notice you're in Leicester, so scrap that one