NAILHEAD RUSTING NAILHEAD RUSTING Red/brown rust stains on the paint surface.
POSSIBLE CAUSES • Painting over non-galvanized iron nails, which have a tendency to rust in the presenceof moisture. • Painting over galvanized nailheads which have begun to rust due to sanding or excessive weathering.
SOLUTIONS • Wash off the rust stains, sand the nailheads, then follow the same surface preparation procedures as for new construction. * When painting new exterior construction where non-galvanized nails have been used, it is advisable to first countersink the nailheads, then caulk them with a top quality exterior acrylic caulk. * Each nailhead area should be spot primed (preferably with stain blocking primer), then painted with a quality top coat.
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