Question: Can weather out seal my garage roof leak
Answer: Weather out is excellent at sealing roof leaks, as long as you find where the hole is. If it is still leaking after you have coated where you think the leak is, you did not find the correct one.

Question: I have a large hole in my roof what do I do.
Answer: When there is a large hole to cover you will need to support the roof sealer from sagging, so you could put a piece of covering on first like thin plywood or roofing felt, remembering to seal all around the edges of the covering.