Dynamat on roof???

Replacing beige headliner on my 39 sedan. Before I put it up, I thought I would like to put a heat insulator/sound deadener like dynamat on the roof. What's the best product? Will it stay and not sag down in heat...and mess up my new headliner? Can I put it up without too much prep of the roof, so I don't mess the interior? How much of the roof should I cover?
Anyone done this with good results?
Thanks

 

I'd think you would use what ever adhesive that the producer/seller of the material recommends for said product. I think I used some spray on upholstery adhesive when I did the roof of my 51 Merc but I just used the foil and foam stuff from Lowes and wasn't all that happy with that. That was 22 years ago though and there wasn't a lot available like there is now.

 

i dynamated the roof in my 51. just peeled and stuck it . its still in bare metal with no interior and hasnt peeled off or sagged. its been in the sun plenty. i thought wouldnt stick but it has.

 

I've used the self sticking Dynamat on several metal roofs with no problems. Also a couple of them were black!

 

In think they make a product called dyna-liner just for what you want to do

 

Dynamat is a "vibration dampener", it keeps the panel to which it is applied from "ringing" or transmitting sound. It will not significantly restrict sound from passing through it however. Coverage for a sound dampener is recommended to be 25%. Unless you drive under low-flying aircraft or other airborne noise sources you will need very little in the way of soundproofing on your roof. That said, restricting parasitic oscillations (ringing of the panel) and reflected noise from within the car make a lot of sense when addressing the roof.

My personal preference is to coat the inside of the roof panel with a thermal barrier coating such as LizardSkin followed by some vibration dampener (Dynamat) and then a layer of closed cell foam (CCF) to limit the reflected sound. The car will stay cooler and quieter without breaking the bank.

 

consider spray on if youre worried about it, lizzard skin or similar product

 

Too funny ... I opened this expecting to see a pic of the DynaLiner coupe on its lid after another out of control donut.

 

the foil covered followed by dynaliner works well. avoid the quiet pads (they may not even offer these any more). I started out with those and they never stuck. something about the adhesive releasing when the roof got hot (black car). they work fine elsewhere, just not the roof.