Hi Thomasin,
I am sure Richard and I will have different ways to do this.
I've attached finished paintings as well as not-yet-painted, preprimed canvas to wood using PVA glue. The board was first given a coat of GAC100 to avoid any transfer of anything from the wood to the canvas.
I've not had any problems with the art staying firm to the wood.
Here's a link you might find helpful:
http://www.amien.org/forums/showthre...?t=1626&page=2