The "Key" teaches you that metal has memory. When you hit a fender, you stretch the metal. When you try to hammer it back flat, you stretch it more. This creates oil canning —that horrible popping sound where the metal flips between convex and concave.
The PDF uses the analogy of a blanket:
Metal bumping and panel beating offer numerous benefits, including: The "Key" teaches you that metal has memory
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Now that we've covered the basics, let's dive into a step-by-step guide on the key to metal bumping: The "Key" teaches you that metal has memory
Used for spreading the force of a hammer blow or reaching into tight cavities. Why You Should Study the PDF The "Key" teaches you that metal has memory