Thanks for the update. I watched the video, and I thought that it was
helpful and it did give one option for a way to deal with your situation and
your interest in seeing if you could resolve it with little expense and some
DIY efforts. Unlike others here, I think that what you did was worth a try
based on everything you wrote so far.
On the question of adding granules, you may not need to since the roof
appears to be black so the black roofing cement that you used probably looks
okay enough where it shows.
I do have a contractor friend who knows a lot about roofing and who doesn't
charge a lot. I have used him for replacing shingles and other types of
roof repairs and he basically just charges for his time plus the cost of
materials. But, it sounds like you may have solved your problem for now and
you can wait and see if you need to deal with it again in the future using a
different approach. If it does turn out that you need to replace a section
of shingles to fix the problem, it looks like you could probably get
replacement shingles that will match fairly well (except for the fade
factor) since your roof looks like it is a standard black color.
Good luck. Hope what you did works.
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