door panel water shields question

65 SD L79 · Canadian Poncho Superstar!

door panel water shields question

SD 396 · Poncho Master!

These were more of a moisture barrier similar to your home with a temperature differential between inside and outside. Earlier cars had paper which would absorb some of he moisture, then later went to plastic. I still use them, they are not intended for keeping rain out, the rubber at the top of the door against the glass should look after that.

Pontiacanada · A Poncho Legend!

SD 396 wrote:
These were more of a moisture barrier similar to your home with a temperature differential between inside and outside. Earlier cars had paper which would absorb some of he moisture, then later went to plastic. I still use them, they are not intended for keeping rain out, the rubber at the top of the door against the glass should look after that.

Great answer. Yes cars sweat with temperature fluctuations.

oshawacliff · Poncho Master!

Another consideration would be having the car sprayed with Krown or Rustcheck

unruhjonny · Guru

I have observed that before the 1980's what was used was a heavy brown paper with one side having something akin to a skimmed tar coating on it;
the black (tar) side faced inward - on the "wet" side of the door, and prevented water from soaking into the cardboard backed door panel.
It seems obvious that it wasn't intended as a seal like the later plastic barrier was, as it was only held in place by a handful of pieces of wide masking tape.
(the plastic barrier would generally be held in place by a bead of product which would never fully cure - which meant the plastic could be pulled back, then resealed)