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Space blankets have little to no R-value. Their value is in trapping heat as a solid membrane with no airflow through the material. There may be some slight reflection of radiation, but the best use on a hummer would be to wallpaper it over the roof externally to reflect solar radiation.
The pool insulation is interesting, any encapsulated foam or fiber that can be attached and somewhat sealed around the edges would trap heat against the roof and potentially reduce Temps. You'll still have plenty of solar radiation coming through windows hitting the interior that will absorb heat.
Not sure if your talking issued or surplus personally owned.
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