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The outer panel to the rear wheel arch of four-door vehicles can have an open seam at the bottom of the C pillar adjacent to the sill rocker. This hole arises from the double cavity formed by the inner and outer rear wheel arches. The larger external panel meets the rear 'dog leg' at the base of the sill rocker where the manufacturer applies mastic to fill the small crevice. As this mastic is usually very viscous it does not flow into the crevice and open spaces ready to corrode are often left behind. These open areas will allow road spray to be sucked in and initiate either crevice corrosion at the steel-mastic-steel interfaces or metal penetration along the rear dog leg. (reference)
