NZGeordie,
Can see a few problems arising from using pine or ply as a ground. If you lay the veneer along the same grain line as the ground it is most likely you will have the veneer cracking as the wood base will expand at a different rate to the veneer. It would not help in such an instance to veneer on each side because the problem would remain.
If you do lay veneer on wood then it must be laid at right angles to the base grain. In effect creating another layer of ply. (Hope I'm making myself clear).
Yes I agree with the concept that what you do to one side of the wood must be done to the other to even out tensions.
On the use of contact as a method of veneering I personally never use it. Most of my veneering involves butt joining veneer to get effects I am looking for and one effect I do not want is to see gaps appear. Contact adhesive is a rubbery finish that creeps, too unstable for butt joining. It can be used where one continuous sheet of veneer is used, but there are better techniques. One method I use with success is to coat the veneer and base with cross linked PVA. Allow it to dry and then reactivated it with a household iron which is used to press the veneer into contact with the base.
Jerry
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