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Nailhead Rusting

Reddish-brown stains on the paint surface.

Possible Cause:
Non-galvanized nails have begun to rust, causing bleed-through to the top coat.
Non-galvanized nails have not been countersunk and filled over.
Galvanized nailheads have begun to rust after sanding or excessive weathering.

When painting new exterior construction where non-galvanized nails have been used, countersink the nailheads, spot-prime with an oil-based metal primer, then fill with a top quality, water-based all-acrylic or siliconized acrylic caulk.
Paint with a quality latex house paint.
When repainting exteriors where nailhead rusting has occurred, wash off the rust stains, sand the nailheads, then follow the same priming and filling procedure as above.

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