I honestly wouldn't use something that expensive or difficult to remove.
Save your Dynamat for the outer door skin where it is doing some good.
I have a contractor bag, split in half to cover both doors.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.