Door foils to protect the door boards.
Because if these pressboards get wet, they would become wavy and unsightly.
Finally, we have found a supplier who makes it unnecessary to procure the foil and the sealant and then still long to cut the whole thing to fit.
66-70 B-Body
2 Door Hardtop
Door & ¼ Water Shields
(With Butyl Adhesive) Mylar 4pc
Mylar® is a DuPont-trademarked name for a bi-axillary-oriented polyester film (BoPET).
R.E.M.