Why does this thread feel like trying to pull teeth? OP, are you trying to say that there may be some sort of seal or barrier missing because that area you took pictures of is caked with dirt/road grime or implying something different like they forgot to put some kind of rust protection in that area? I'm not exactly sure what you mean by the word "sealant". Please try to be clear with your wording so that those of us that cannot read your mind can understand what you're asking, thank you.
what you see on these pictures is the rust protection i put myself, because their is no protection against rust on this area. Normally, a door is fabricate with a metal frame and a panel that goes on. Each edges are folded inside the door. Then a sealant joint is suppose to close the gap between the frame door and the metal panel, to keep water outside, preventing rust.