prime render & plywood before tiling?

I have a newly rendered (cement) wall and a partition at the end of the bath which is made from marine ply. I want to tile both the wall and the plywood. Do I need to prime them before I tile them? The tile cement instructions do not mention anything about priming new/bare walls/wood.
Does anyone know?
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You don't need to do anything to the render, but you should prime bare wood by painting with wood primer
--
Chris French, Leeds

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