Nailhead Rusting

Nailhead Rusting

Reddish-brown stains and spots on the paint surface.

Possible Causes
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, waterbased 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 con