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Close up image of a surface with reddish-brown stains.

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 nail heads have begun to rust after sanding or excessive weathering.

Solutions

  • When painting new exterior construction where non-galvanized nails have been used, it is advisable to first countersink the nail heads, then prime with a rust-inhibitive primer, and caulk them with a top-quality, water-based all-acrylic or siliconized acrylic caulk.
  • Each nailhead area should be spot-primed, then painted with high-quality exterior paint. When repainting where nailhead rusting has occurred, remove rust stains, sand the nail heads, then follow the same surface preparation procedures as for new construction.

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What Product Do I Need?
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What Sheen Do I Need?
8 Oz. Sample
1 Gallon
1 Quart
5 Gallon
The following product(s) is required to properly prep uncoated and previously coated concrete surfaces.
Required product
BEHR PREMIUM ALL-IN-ONE WOOD CCCC
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The following product(s) is required to properly prep uncoated and previously coated concrete surfaces. Only available in store at Home Depot.
Required 3rd party product
BEHR PREMIUM ALL-IN-ONE WOOD CCCC
The 9 in. x 1/4 in. Polyester Adhesive Roller Cover has a hard texture, making it ideal for applying all types of adhesives to smooth surfaces. It can be used for stippling and applying sand paints.
The following product(s) is recommended when a topcoat clear finish is desired.
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