I just did the "address the grey foam issue" fix recently following the guides put forth on this site. I used Gorilla's 4 in wide "Patch & Seal Tape" product. It has backer material on it to keep the roll from sticking to everything while you contort your arm into the hole. So I cut the tape to length (and width as needed, since it's so wide), removed a piece of the backer material, got the tape set just right on the little metal door, and striped the backer material to finish applying the tape. I also poked little holes all through the patch tape in case having some diffusivity was helpful (since Porsche went with foam themselves rather than a solid piece of aluminum).
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