Dynamat products - which to use?

[chrisbutnut]

I've got my rear seat out (68 Coupe DeVille) so I can have the door and rear quarter panels redone (which are also out).  I'd like to put some Dynamat product down on the floor pan under the rear seat, and then also use something on the vertical surface behind the rear seat back and the insides of the doors and rear quarter panels. 

Dynamat has a variety products that they offer:  Dynapad, Dynaliner and Dynamat (Xtreme, ProX & SuperLite).  I'm a bit confused on which one to use, and don't want to have any issues re-mounting the rear seat or the panels (if the sound insulation is too thick). 

The previous owner replaced the carpet, so I don't plan to pull that up.  I'm not sure if they used sound deadening under the carpet, but can tackle that later.  I also have noticed that there is no sound insulation in the trunk.  I plan to have the floor of the trunk carpeted at some point, so I should probably use a Dynamat product there as well.

Any thoughts?  The structure behind the rear seat back is not a solid piece, and there are various openings in the doors and rear quarter panels.  Do I need to cut around those?

[J. Russo]

I used Dynamat Xtreme and Dynaliner 1/4" in my 1941 Series 63.

Xtreme is used for sound deadening and the Dynaliner is used to reduce Heat. I noticed quite an improvement with both. My Cadillac will be even quieter once I get the weather stripping installed around the doors.

If you use both products to cover the same area, Xtreme gets installed first, then the Dynaliner covers it.

You'll need to consider carpet clearance for anything that moves over these materials like the adjustment of the front seat.

[Abe Lugo]

In the rear opening to the trunk there usually is a heavy board like the door panel material as a barrier. 
My 41 has a piece of plywood.

[Abe Lugo]

Also note dynamat is just a brand name at this point you can get the generic stuff and get the same results. 
There is sound foam called silless that like for doors and above headliner. 

The black tar/foil stuff like for floor needs to have foil tape around the edges to seal it shut. 
Amazon sells a blue alternative to the dynamat one  on floors besides the heat barrier.  You still should have the jute line under your carpet. 

[dn010]

Also note dynamat is just a brand name at this point you can get the generic stuff and get the same results.

I agree. You can get various brands and thicknesses but I opted for 80 mil "kilmat" from Amazon and it worked just fine in the 57. I paid about $58 for 36 square feet about 5 years ago, not sure what it is up to now.

[Gene Beaird]

<SNIP>

Any thoughts?  The structure behind the rear seat back is not a solid piece, and there are various openings in the doors and rear quarter panels.  Do I need to cut around those?

If you're wanting sound deadening and heat shielding, you're going to want to have a solid sheet on those.  Cutting holes in the material to match the openings in the panels will give you little of either.  Since most of that stuff has an adhesive side you stick to panels, you'll probably want to use some sort of thin plastic sheet to span those openings so dirt doesn't stick to the backing of your material. 

Nice to know about that 4mm stuff.  That might come in handy on a project on our 1980 Wanderlodge where we don't have much space.