I used mat and resin - no paste until I filleted the seams. Then I used cabosil and resin. Did this with a fiberglass pro looking over my shoulder.
Then we used HUGE, welded, box-tube, clamps - 3 of them, with multiple clamp points on each clamp, along with 2x4's, to sandwich the transom skin, the mat and the ply wood.
10 years later all is solid ! I agree that epoxy is a stronger, better material. My buddy was just old school, knew what he was doing with polyester and hey!, I think that if water hadn't found it's way into my original transom - the original transom would still be fine !
I think that it will all work - if done right. Personally, the most important part, for me, is to over drill every damn hole and fill with epoxy and then drill through that so water will never find its way to wood again...
Good luck. And, for the record, I ALWAYS defer to the guys on this board - I am a novice restorer. There are some VERY talented guys who will give you the best advice. Listen to them.
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