should I seal off the holes in my door panels

[headless 10+ year member]

I've seen the covering just spread over the holes before...it works ok even without a backing, but not as well as with a wooden backing for the deadener to actually stick to.

 

[ramos 5,000+ posts]

I use acrylic plastic most of the time. Custom shaped to the doors //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif