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I have a 2012 A-122, and replaced the foam seal about 1-1/2 years ago. Stared with a PLASTIC putty knife, with a sharpened edge, to remove as much of the foam as possible. Then used Goo-Gone and the putty knife to remove the residual adhesive. Then wiped cleaned surface down with isopropyl (rubbing) alcohol. I think I used about a 70% isopropyl, just to remove any residual Goo-Gone. To assure a nice straight line of the new foam strip, I taped down a piece of angle iron as a straight edge---anything straight, like a good wooden 1x4, would suffice though. Applied the foam strip, and the ran a bead along both edges to prevent future edge-lift using Dicor Lap Sealant, non-sag.
My rear roof panel has about a 1/4" sag, so to get a good seal all the way across the panel, I added a shorter strip of foam across the major portion of the sagged area, then applied the top continuous strip. So far, so good!
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