[DeTomaso] Door cards.

Hi all,just fitted a pair of new door mirrors and was in the process of refitting the door cards when I remembered a piece of advice a friends dad gave me forty years ago ( yeah I know) " don't put the plastic back on the door behind the card as it causes condensation and inevitably corrosion" What do you guys think, leave the plastic on or bin it? Thanks for any input Michael Sent from my iPad