Fiberboard trans cover

[William Hartwell Woodruff <woodruff@engin.umich.edu>]

 Scott asks
   'I've been thinking of spraying the underside my cardboard tunnel in
    the TR6 with a rubber undercoating spray.  Has anyone done something
    like this?  I would think that it would help insulate heat from my
    right leg, and reduce noise.'

I've done just about everything I could to the fiberboard tunnel
cover in my Spit. (fiberglass, undercoating, sealer etc.) it seems
to be roughly the same piece of junk I began with.