Nail head rusting is the reddish-brown stains on the paint surface.
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 nail heads have begun to rust after sanding or excessive weathering
When painting new exterior construction where non-galvanized nails have been used, it is advisable to first countersink the nail heads, then caulk them with a top quality, water-based all-acrylic caulk.
Each nail head area should be spot primed, then painted with a quality latex coating.
When repainting exteriors, where nail head rusting has occurred, wash off rust stains, sand the nail heads, then follow the same surface preparation procedures as for new construction.
Have you noticed small droplets appearing on your fresh coat of acrylic paint? Don't panic – it’s a normal part of the curing process. Find out more.