What is the most common way door skins are secured to the door frame?

The most common method for securing door skins to the door frame is through welding or adhesives. This approach is widely used in automotive manufacturing and repair because it creates a strong and durable bond that is essential for maintaining the structural integrity and appearance of the door. Welding provides a permanent attachment, ensuring that the skin remains securely in place even under stress, while adhesive options like epoxy can also offer a strong bond that allows for some flexibility and reduces the risk of rust formation at the joints.

In contrast, while screws and bolts can be used in certain applications, they may not be the most effective for door skins due to potential movement and vibration which could lead to loosening over time. Body filler, on the other hand, is not a fastening method, but rather used to smooth out surface imperfections. Therefore, welding or adhesives are favored for their reliability and efficiency in securing door skins.