I didn't have any on the topsides of T397, but a gazillion on the bottom. They appeared after I abrasively removed all the paint and did a bit of fairing-by-gelcoat-lump-removal. The spots that didn't just pop open showed up as little short lines or halfmoons, which once pressed at with a jackknife were just the same thing.

These are no big deal (unless they are topside and you have to fill 'em all, hehe) in a structural sense or whatnot...the outer layer of matting just didn't get saturated all the way thru in a way that would have bonded it completely to the gelcoat and there were little air bubbles there. Wouldn't take it as indicative on the rest of the laminate, either. These boats were all made in an incredibly resin-rich fashion...de-airing roller? Hunh? What?
The only roller these boats are likely to have seen was a paint roller dripping with resin which was used to both saturate (!) and smooth down the laminates. Makes perfect sense now, don't it?

Dave