Lower siding of my car is coming loose.
As seen in the picture the siding below the
doors is coming loose. Is there any kind of
sealant I could use to close it up? Or is there a
clip that came loose that needs to be
I believe that the small white plastic part is one of the clips designed to hold this part close to the car body. If it no longer holds the trim in place, get a new one either from a dealer or parts store and replace it.