If water seeps between your door and weather stripping and freezes, you could be frozen out of your car or truck. To prevent the water from freezing you out, coat both the weather stripping and the mating door surfaces with spray silicone. To avoid spraying silcone into your car's interior, spray it directly onto a clean rag. Then wipe the silicone lube onto your door and trunk weatherstripping. Repeat the procedure on door mating surfaces and the truck lid.