WRC has only one advantage - weight.
I like pine for a GP and I laminate them. I have WRC too and you have to make them thicker otherwise they are not strong enough. So, it's weight vs. shape.
Why don't you think there are commercially made wood paddles out of unfinished wood? They all have glass and polyester coatings.
On the other side of it all, I don't mind dings and bruises because that's what a GP is to me. Here's a shot of my most used GP:
Isn't it beautiful!
Full Size Sail Rig
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