Sorry to hear about your delamination problem. Yes, that nasty storm that you went camping in probably was the culprit. But, the potential problem had to have already been there. It's a good thing that you are still working on your teardrop because that may have enabled you to find the delamination sooner, thus keeping the damage minimal.
I'm fairly certain that you know 'Fill-it' stays white when it cures; but, just in case you don't, you know now. If you can save the area with CPES followed by the same fiberglass method that you used on your visible seams, it might not show as bad...don't know.
Water can be insidious and delamination is something that all of us must fight, regardless of how experienced at building we might be. Therefore, delamination is one of the most alarming words in a td/ttt builder's vocabulary. With your attitude, you will win against it. You've done a good job on your teardrop and continue to do so. I'm cheering for you.
