Make a slightly oversized "barrel" to put over it with this product. Leave a bit of air space between the jug and the foil. https://www.lowes.com/pd/Reflectix-R-21-50-sq-ft-Unfaced-Reflective-Roll-Insulation-24-in-W-x-25-ft-L/3011904 Use the aluminum tape they sell to put it together.
That's a cool idea.
I've provided a better solution but it seems a nigger rigged solution is what you're intent on. Good luck!
Yikes. #
Full disclosure: I was an area rep for the company ~30 years ago. It's a really good product for blocking radiant heat.
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