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Sill Seam Corrosion

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    Sill Seam Corrosion

    My son sent me this pic of his driver's side sill, showing some corrosion at a panel joint under the door.

    Click image for larger version

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    I'd like to understand this seam better. Are the sills covered with a sort of vinyl coating? At one time I cleaned them up and sprayed with SEM trim black.

    I had to zoom in on this pic to even find the seam, they're always too dark in most pics.

    Click image for larger version

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    If you look at the panel construction on the sides, #4 "cover" is the sill piece and looks to go full length all the way to the rear wheel opening (?).
    So what's the non-sill-shaped bit at the rear (right in drawing) end? Is the rear quarter panel installed over the top of that area?
    Click image for larger version

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    Click image for larger version

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    And is the forward end of this piece the joint at the front fender? So where is this seam under the door? What's behind it?

    Thanks -