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For those that smooth..what's your process? Backing..filler..etc

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I kept what I needed with this and welded, ground and patched everything from there. Car was original AC car so a new 1 piece patch was welded in and moved forward to align with all of the higher spots on the firewall. All other holes were welded shut and all of the waves in the inner fender wells and firewall were smoothed out. They're a lot easier to keep clean when they're smooth and have good paint on them.