E29 Well this looks kind of scary

I did a double, then triple take on this one. Is it a view of the night sky? Is it a group of small towns seen from a jet airliner? No, it's the view looking aft under the quarterberth on my e29. Where I've sanded down the gelcoat over blisters, light shines through. At first glance, it looks like the hull is full of holes!
I've been trying to convince myself that the hull is no thinner in those spots than any place else. It's just the opaque gelcoat layer has been removed. From the outside, there is no cavity to be filled. In fact, before I started sanding, those blisters weren't visible at all. (Larger ones on the keel were visible.) That is, they were no thicker than the bottom paint. Or perhaps because of the curvature of the hull, I sanded the cavity flat with it's surroundings.
This is what it looked like as these things began to emerge from the multiple layers of old bottom paint.

Since there is nothing to fill, except in a few cases, my plan is just to proceed with four coats of interprotect 2000. And hope that these constellations go away...