Car wrapping vinyl. I've been toying with adding building insulation foil to the inside as well, but it's hard to do neatly since this is a cargo van without headliner in the back. Sourcing an OEM headliner would cost too much, add weight and not look that good unless you also added all the extra pillar trims to match.
I'll probably add building insulation when I drop the headliner in the cabin (I almost bought some aerogel to stuff in there). You can definitely feel heat coming from there, since that part of the roof is visible I don't really want to chrome wrap the exterior.
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