wood treatment

Question is, what product should i use to preserve and smarten my plywood outboard bracket mounting plate?

I reckon what ever varnish you have handy. Touch up re-varnish as necessary. It's going to get damaged so the weather will get under the varnish, just try to tart it up before it gets too bad.
 
It's the mounting plate for the bracket not the outboard do I even need one. Or could I mount the bracket direct on the transom (it has a backing plate on the inside)
 
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