I talked to one roofing contractor who has been in it for 30 years. He told me the all the cool seal had to be scraped off Clorox spray clean ospo put on Rust areas and wired scraped off. Then two coats of Gaco Roof put on. Now some are saying go with a rubber roof but with ...
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But then if you hired a professional to do this analysis you'd factor in probable roof life, your specific roof complexity, flashings, contractor reliability, workmanship, and the trouble of having to go through re-roofing sooner with one product vs. another. For a more scholarly approach see...