Jeffco tank sealant is a good choice for the inside of the cowl. DuPont
Cor-Lar two-part epoxy paint in white is another good choice, enabling you
to easily spot drips from leaks and identify fluid types by their color.

One other addition I'd recommend in any areas where the cowling interior
surface will be closer than about three inches from a high heat source
(headers, collectors, turbos, etc.) is to cover the interior surface locally
with the sticky-backed foil-lined 1/4" heat insulation blanket available
from Spruce or other sources. Tape the perimeter of the heat blanket down
with aluminum heat tape for a nice finished look. These little heat blankets
don't have to be very big, but they are really effective in saving your
exterior paint from bubbling and other effects of high heat exposure.

Best,

Larry Graves

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Subject: [LML] Legacy cowling--inside finish