If it hasn't already been mentioned,
In many circles the seal you are describing is known as a 'form-in-
place' seal. Working on military aircraft myself, we sometimes use
tricks like wax paper, tape and even plastic wrap. More commonly, we
use a spray-on Silicone Release Agent. Assures a
" An additional step might be to place a very thin plastic like "Glad cling
wrap or equivalent" or other no stick cover on the bottom half to have the
silicone form a seal without binding."
A smear of oil or grease on one side only will also do the trick with no
risk of wrinkles .. done that
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