5200 would do it, could be a real sticky mess to do, and takes time to cure.
I'm thinking how you clamp and hold the MLV to the interior so as to have good consistent bonding to be the bigger challenge of your project. Maybe shape some boards or ridged foam to clamp against on the interior? Do you have to preform or slice the MLV to suit the concave surfaces?
I downloaded a decibel meter app to my phone that works pretty good, that would give you some objective before and after data too. 'Sound Meter."
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