My method of insulation was time consuming but works well.
I used a new plastic trans cover for my GT-6. On the underside of the cover I
applied expanding foam insulation (using the better part of 2 aerosol cans). I
did several iterative quick fittings / foamings to determine the maximum
quantity of foam that I could apply. Foam thickness varies from 0.5 to 1.5 in
thick. I used various tools (utility knife, wood rasp, body filler file, key
hole saw, etc) to shape/smooth out the expanded foam. Once the foam was shaped
with at least 0.5 in. clearance to the trans, I applied a layer of fiberglass
cloth and 2 coats of polyester resin to seal the insulation. On the interior
side of the vehicle I filled in the void at the top of the trans cover (below
the radio location) with foam and then I applied a layer of the metalicised
bubble wrap insulation (available at many home improvement centers in the US)
using contact adhesive.
A final note: the plastic trans cover did not fit well to the existing vehicle
holes (cover had warped as part of the molding/cooling process. I spread the
cover to the desired shape (using scraps of wood and screws) prior to applying
the polyester resin. Once the resin hardens up, the cover becomes a very strong
part and would be much more difficult to flex into position to install, if the
resin hardened with out the spreading of the cover.
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