My 2010 FF has the Alpha-ply roof. After doing some research on it, I am of the opinion that it does not need a sealer unless you want to maintain the look of it cosmetically. I would focus on the sealing around your protrusions. You need to use Dicor for any sealing that you do on the roof. Inspect your existing Dicor for dryness, cracks, holes, etc. and touch those up each year. Other than that, you can clean the surface of the roof with water, spic n span, and a medium bristle brush or broom.