Sealing a Membrane Roof

Debra in Montana asked:

I have a 75 ft.² flat roof that has a membrane that is 25 years old and has never had any sealer put on it. I was told not to put a sealer on. I recently put on a POC number 139 because of all the small cracks and leaks that have been happening. That is a fibrous asphalt sealer. Do I need to put down granules on top of that or can I seal it with a non-fibrous asphalt roof sealer like blackjack? I wanted to put down two coats because we shoveled that roof off in the winter from snow load. So can I put a non-fibrous asphalt sealer over top of a fibrous one?

Henry Staggs said this in response: