I believe it also helps vibration. I wouldn't want to remove it myself. Without that, the door will probably sound cheap and hollow when shutting it.
I wish they would have coated the entire inside of my doors with it instead of just the middle. It's the only part that doesn't rust. I've never seen this stuff peel off on any that I had.
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Bob
63 Impala 283/PG/3.36 (under restoration)
66 Impala 327/PG/3.36
66 Chevelle SS 409/M22/3.55
69 Chevelle 307/PG/3.08 (future restoration)
69 C10 short stepside 454/TH350/3.73
69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!)
71 Cheyenne 20 fleetside 350/4 spd/4.10
71 Chevelle 6/PG/3.08
72 Chevelle 454/M21/4.10
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