Delamination?

[dheaslip]

Hello

I recently purchased a 1982 '68 Gulfstar Sailmaster and I have some issues with the hull. When we hauled it out for survey we noticed a good number of blisters and after purchase we put it on the hard to repair them. After grinding off all the paint and gel coat we noticed some unusual lines in the fiberglass. We ground out the blisters and have been letting the hull dry for the last two months, but we keep noticing that more and more "dry" areas are appearing. It's starting to look like the hull has a complete layer of fiberglass that is not adhering well to the layer beneath. In fact, you call pull the fiberglass away without too much trouble. The previous owner admited (after the sale) that they'd had layers of fiberglass peel off the hull in heavy weather a couple of years ago, but in their opinion it was "no big dea!"

I'm curious to find out about this layer, because it looks like a) it was applied after the hull was taken out of the mold, or b) a few layers were laid down in the mold and them they resumed the rest of the hull later. I've tried to contact Lazzara Yachts (who were the original designers back in the 80's) but no one there will talk with me. My surveyor is running out of ideas.... We're not sure if we can just remove the layer (if it is just cosmetic) of if we need to remove it completely and re-glass the entire hull.

In the photo you can also see a line in the fiberglass that is identical both sides of the hull and looks like a join the the glass. I've also posted a close-up of this. I've never seen anything like it before.

Does anyone have any idea what's going on here? I'm planning to take my family cruising and need to know if we have a significant structural issue here, or if the layer is just cosmetic.

Regards
David