The Dynamat sound & heat deadening material looks like a great choice for my Kaiser. An upholstery shop recommended its use only on the floor, firewall and doors but not on the headliner due to heat on roof.
Thank you.
And just FYI, FatMat is essentially the same product but costs a bit less. RAAMMat is also an option.
As to the headliner issue: I know guys that have used Dynamat under (or rather, above?) the headliner in various vehicles before without too much trouble. The problem with any number of different sound/heat deadeners with regard to the headliner is A) depending on the product, if the vehicle spends a lot of time in extreme heat it can loosen the adhesive and cause it to start to peel/fall, which will make your headliner eventually start to sag as well and B) there are some products that people have chosen to use that create a risk of moisture absorption if the car spends a lot of time outside in inclement weather (say it's parked outside in winter and you get a lot of snow)
That being said, there's a lot of options people use with varying degrees of success, and just as many folks that will say don't bother with anything at all under the headliner.
