I did a little fiberglass work tonight, too. The top and bottom cowls don't align, so I added some fiberglass filler to get the levels to match. Photo 1 has peel-ply over the work.
The tabs that hold the fasteners for the center/front cowl, had the fastener holes off center. So I decided to glass them and start over. I filled the holes with fiberglass mat (the thick kind used as filler), put one layer of glass over it, and then 3 layers backing it up. This should fill the hole and give it some more purchase for the fastener.
Cowl work
Hole in tab glassed in (even though it doesn't look like it)