I have done some flanged repairs before but I quit using them after a very good sheet metal guy I know explained how much time I could save properly fitting a butt type repair and then there is no metal behind the repair to be seen or hold moisture etc. Another reason I quit using them was when you flange a panel with compound curves, the curves get compromised and it just makes the job even worse. That's no good when you're a beginner any how.

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