I've started installing some b-quiet Brown Bread sound deadener (dynamat)
material to some of the panels in my 90 Carat.  I have a few concerns...

This stuff is REALLY sticky - pretty much permanent.  I would think that if
I ever needed to get to the sheet metal below, it would be very
difficult/messy.  Has anyone had any problems as a result of this?

Dent removal comes to mind (I've had paintless dent removal done on another
car w/ excellent results).  I know the PDR guys work out dents from the
inside, but I don't think it would be possible w/ the material there...?

This wouldn't be an issue on panels that you don't see, such as under seats
and floor.  But, as I'm also currently installing some audio components, I
can foresee some problems in these areas if I were ever to modify or expand
the system or add additional accessories, requiring drilling into the sheet
metal.

Last, certain panels look as if they already have damper material installed
from the factory.  The engine deck, "firewall" under rear seat, and drivers
footwell all have a layer of similar material over them, painted over by the
factory.  Is this, in fact, noise reduction material?  Would I benefit from
adding an additional layer?  Is there any place I definitely should NOT
cover?

Experience and thoughts appreciated.

Thanks,

James V
90 Carat