Friday, April 23, 2010

Nail-Head Rusting

Rust stains can occur at the actual nail heads or as lines of runoff from an accumulation of rust that has bled through to the top coat. Found mostly in older construction. 

Nailhead rusting 

Causes:

  • Nongalvanized iron nails either were not countersunk and filled over or their covering putty has worn away. 
  • Galvanized nails have begun to rust after sanding or prolonged exposure to the elements.

What to do:

  • Wash off rust stains with detergent or oxalic acid solution and a stiff brush, sand the nail heads, spot prime with an oil-based primer, and repaint with latex. 
  • If possible, before priming and repainting, countersink nail heads and fill holes flush with the surface with all-acrylic or paintable siliconized acrylic caulk.

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