The manual and every guideline I've read warns against using a power sander on chines and edges because of the chance of cutting through the fiberglass.
Well I did use a random orbital sander on my WD12, chines and all, and it does not appear that I have sanded into the fiberglass at any point.
Wouldn't it be obvious if I did? Wouldn't I see some fuzzies where the sander bit into the fiberglass?
I'm not disputing the wisdom of hand-sanding at such critical points. But since I've done the deed, I just want to determine whether I may have made an error that is invisible now but will show up later.
So what say you? Am I going to be sorry?