NAILHEAD RUSTING:
Reddish-brown stains and spots on the paint surface.

POSSIBLE CAUSES:
• Non-galvanised iron nails have begun to rust, causing bleed-through to the top coat.

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

• Galvanised nailheads have begun to rust after sanding or excessive weathering.

SOLUTION:
• When painting new exterior construction where non-galvanised nails have been used, it is advisable to first countersink the nailheads, then seal them with a top quality, water-based all-acrylic or siliconised acrylic sealant. Each nailhead area should be spot primed, then painted with a quality water-based 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.

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