Ok well heres how the day went. I went to local rv shop to buy some dicor. The owner was working the counter so I told him what was up. He cursed the day skylights wer born. He also advised drill 1/16 holes to stop the crack and eternabond all around it. So that's what I did. I also bought a tube of dicor as well. I found another crack in another skylight so I drilled and dicored it and caulked some other spots. 30$ spent but I think I can sleep easy knowing it should be good until the fall check up.