To OP: Cranks look fine and I would confidently ride it myself. Although I did switch to alloy cranks (XTR's & Hope's) on all my bikes for this reason!
Epoxy wasn't recomended to me because it doesn't allow you to see if there's any crack developing...
Que estranha
I’d think you could see right through a thin layer of epoxy.
Well, it was an carbon repair expert company that told me..... What can I say...
Fair enough. Can’t understand the logic behind that one since the Carbon is layed up in epoxy to begin with, and a thin layer should cure in a manner that could be easily seen through. But I’m no carbon fiber repair expert.
FWIW, the part that is damaged on your crank is the part of the arm where the carbon is thickest. With a tiny scrape like that I wouldn't be worried about riding it at all.