I have a ~1 inch crack from a middle edge up. Anyone fixed a small crack with success? I’m thinking drill a hole at the top of the crack to stop it and cover it with lap sealant.
Two ways to patch it so it doesn't turn into a leak:
The temporary way: Drill holes, put Eternabond tape over it.
The real way: Pay the $100-200 and replace the dome. If the temporary fix doesn't hold, you will be out tens of thousands, so might as well do it right.