I have done maintenance on my 2012 roof last May.
I cleaned it with a mild soap (Spic-N-Span) and water mixture and a soft scrub brush.
I looked at the edges of the existing sealer to the fiberglass roof for separation, dried out, and usually dark dirt stains where water puddled.
Then I purchased 4 tubes of self leveling sealer and applied over all the existing sealer edges and fiberglass roof. I didn't find any dried out edges so just laying a thin later over the existing did it for me.
Hope this helps you.
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