Here you can see half of the firewall coated with undercoating.
Also notice the nice, shiny black paint on the frame. I am very
impressed with POR-15. It dries very fast, brushes on smooth,
and has a very tough finish. I had several things fall onto the
frame after painting it, and it wasn't even scratched!
washing the firewall and underside of the jeep, it was easy to
mask off what didn't get coated and give it a good coating with
rubberized undercoating. It goes on very thick and has an orange
peel texture. It dries hard and is paintable, as well.
One thing that
drove me nuts with the old engine was the amount of noise that
came through the firewall. It was deafening (exhaust leaks don't
help either). I wanted to reduce the noise and also keep the heat
from burning my throttle foot. I used some heat reflective, fiber
padded insulation to accomplish this.
The padding is
made out of the same stuff used in many cars to deaden noise. It's
basically identical to factory padding with the exception of the
reflective layer, as can be seen in this photo.