This photo is the original glue, full and natural. Generally, the raw rubber is made by machine, or coated with special materials and tools.
This photo was printed from the back, which is obviously irregular. At first glance, it is not printed by machine, and even with special tools, the factory shape can not be printed.
Why re-glue? Then consider whether there is a big accident, replacing sheet metal parts or cutting. In order to avoid this situation, you must learn to distinguish the accident car. The simplest thing is to see whether the screws of the car have been unscrewed and whether the glue in various parts has been re-adhered.
According to the accident size of the spare tire box, determine whether the spare tire box is original factory plastic or sheet metal plastic. Generally, the spare tire box is different from the original factory, and the spare parts are replaced by repair, shaping or cutting. If the sealant is different from the original factory, the brand should be different, but the glue will not have much impact on the car. For the accident car, it is not serious, just a slight plastic surgery, and no sealant is needed.
Why do you want to compare the engine compartment? Because most of the body gluing is done by machines in the process of body manufacturing, which is relatively regular and orderly, but there are still dead corners of the machine in some corners of the body, which need manual brushing, but the manual brushing is not very regular. Whether it is the original glue or the back glue can be seen from the comparison of the glue brushing marks in the front and rear cabins. General auto repair shops, including most 4s shops, do not have very professional glue brushing equipment, so the traces of manual brushing are obvious. If it's an accident car major, it's hard to see the repair technology. You need to look at the tailgate screws and insurance records. Basically, small rear-end collisions have insurance records. If it is a major accident, the solder joint of the door strip can be clearly seen.
I hope I can answer your doubts.