Main paint problem list

Exterior problem
Nailhead Rusting

Nailhead Rusting: Reddish-brown stains on the paint surface.

Possible Cause:

Non-galvanized iron nails have begun to rust, causing bleed-through to the top coat.

Non-galvanized iron nails have not been countersunk and filled over.

Galvanized nailheads have begun to rust after sanding or excessive weathering.

Solution: 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, water-based all-acrylic or siliconized acrylic caulk. Each nailhead area should be spot primed, then painted with a quality latex coating. When repainting exteriors where nailhead rusting has occurred, wash off rust stains, sand the nailheads, then follow the same surface preparation procedures as for new construction.