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By barn metal, do you mean typical corrugated tin? They manufacture (assumming that they still do) a wood strip , flat on the bottom, and profiled to the corrugations that is used as a closure strip. You could apply a bead of construction adhesive, apply a few clamps, then send a few short metal screws , or even pop rivets if you did not want to have scew heads visible, from the top. When it is set, recruit a few "volunteers" to dress the sharp edge of the tin with some wet/dry paper or small files.
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