Re: [DMCForum] more sound-proofing questions
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Re: [DMCForum] more sound-proofing questions



> do not use the readily available spray
> glues that you can buy just anywhere as when the vehicle gets hot all
your
> work will be destroyed.

Greg,
Can you explain more what you are talking about?  Do you mean that the
glue
lets go and gets sticky when it gets hot?  I had this problem before with
an
aerosol spray adhesive when I put the dash together on an old Plymouth.
It
was just like trying to glue the panels together with corn syrup.  I
wouldn't put anything in the doors that could hold water.  You would never
realize how thoroughly wet the inside of a DeLorean door gets in the rain
until you drive around with the door panels off.  Each little drop at the
edges of the window frame will hit somewhere and splatter creating larger
drops that then drip again and ultimately soak the carpet.  I ended up
gluing a piece of shower curtain to the back side of the impact beam to
work
as an umbrella for the window motor.  Since my previous HD window motor
filled with water and rotted, I'm not taking any chances.  I have a whole
photo-essay ready to put together about that.

> Right
> now, though, I'm driving a Buick Regal, which is surprisingly quiet.
> What does GM use? Ha ha.

Farrar,
What GM uses (that I have seen) isn't so bad.  It is very similar to
B-Quiet
Brown Bread only stiffer.  Then they use a layer of something that I would
describe as a thick mat of recycled old stringy rags.  It's obviously
cheap
but better than nothing at all.  Speaking of other makes, the new Lincoln
Navigator weighs 400 pounds more than its Ford Explorer sibling.  Most of
this extra weight is supposedly due to sound-proofing insulation.

> Does anyone know if anyone has used the flat back of the rear "seat" to
> put acoustical foam inside?

There isn't a lot of room between the back of the seat and the back wall.
The rear parcel shelf is high enough to cover most of the seat back
anyway.
The whole shelf is covered with carpet which I think goes a long ways
toward
absorbing noise.  A future project is to remove all of the plywood in the
back (since battery acid rotted away the bottom portion on the passenger
side) and replace it with a quality musical instrument plywood to minimize
internal rattles.  While I'm there I'll see about putting a layer of Brown
Bread and/or Lcomp.

Before I would pad the rear of the seats, I would look into finding
alternatives to the vinyl surfaces in the car -- especially the rear
speaker
panels.  Those could be done with leather over foam or maybe just more
headliner material or carpet.

Walt


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