Spraying the rubber gaskets on your car doors with PAM or similar cooking spray will keep the doors from freezing shut. Just spray and then rub in with paper towel.
Source: freebie website
By Cinnamon from Williams Lake, BC
I've also done this to the rubber/plastic gasket on the bottom of my garage doors! They haven't frozen shut since! Another place I did this was on the spotlights for the dog's pen. The snow slipped off and I didn't have to reposition them!
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Before your winter weather dips into the freezing zone, spray some WD-40 onto a soft cloth or paper towel and wipe liberally on all your car door and trunk seals to prevent them from freezing closed. Also, take your WD-40 can with the little "straw" attached to the sprayer, and liberally spray it into all your car door and trunk locks. The WD-40 will not hurt your car's paint finish, but you should wipe off the excess. This one application on the seals and in the locks usually doesn't last for the whole season, so you may have to reapply. For emergencies, I always keep a very small can of lock de-icer in my purse. - Tori
Won't WD40 deteriorate the seals? (12/04/2008)