DESCRIPTION

Reddish, brown (or sometimes black) stains appearing as blotches or streaks on surface or paint. See also Tannin Staining.

POSSIBLE CAUSE


  • Steel in contact with air and moisture will rust (e.g., nails, steel railings, damaged galvanized, flashing, etc.).
     
  • Steel nails may develop black discoloration when in contact with damp wood that possesses a high amount of tannic acid.

SOLUTION

See Lead Information.
 

  • Prime bare steel as soon as possible with a rust-inhibiting primer or finish.
     
  • Replace steel nails with galvanized or other non-rusting nails.
     
  • Rusted nails that cannot be removed must be sanded to shiny metal; countersunk; coated with a rust-preventive primer; and then caulked, filled, or patched; and topcoated.

INTERIOR

PRIMER
(if needed)
All Surface Enamel Primer
DTM Primer/Finish
or reapply the same coating

See Interior Paints

EXTERIOR