fred42 wrote:
Sorry to go slightly off topic, but if the skylight itself has a small crack, what product would work on that?
I would use a good caulk or sealnat.
I used Quad Max on my camper:
https://www.ositough.com/en/products/view-all-products/window-sealant-window-caulking-quad-max.html
When I did maintenance one time before my skylight overhaul repair, I tried Eterna-Bond on the flat flanges where it meets the roof. I did not have good luck with that method. I thoroughly cleaned the surface as that is very important, but it did not stick which prompted me to completely remove the EB (not fun on the portion of the roof where it DID adhere.
I have read where others have used EB on the skylight with better results than me. I guess you could try it on a sample area otherwise another method might need to be used.