May not be helpful, but I bought a roll of this and lined my aluminium canopy with it.
https://www.bunnings.com.au/ametalin-th ... n_p0810967 It's not the cheapest, but it makes a massive difference. The canopy was like an oven beforehand, even when in moderate sun. It was murder for the fridge and freezer. Now it stays at ambient or below inside, even in stifling heat and blazing sun. I can't comment on how it goes in the cold, but it's high quality stuff, so it should do well.
I cut the pieces to shape using a stanley knife, glued it on with sikaflex and added some flat head screws for extra holding power.