Exterior/Hardboard/Previously Painted/To Be Painted

a. Surface Preparation:


NOTE‚ If lead is suspected in the paint, do not attempt to scrape, sand, power wash, use heat gun, etc., which might put lead into the environment, but rather contact a contractor qualified for lead assessment and abatement

  • very carefully remove any loose or peeling paint by gentle scraping; take care not to dig into or gouge the membrane under the paint
  • treat any mildew with a 3:1 water:household bleach mixture, leaving it on for 20 minutes and adding more as it dries; wear eye and skin protection; rinse thoroughly
  • scrub off dirt, chalk, treated mildew with a detergent and water mixture; rinse thoroughly



b. Priming:

  • priming is helpful but not necessary if existing paint is in excellent condition, unless specified by paint manufacturer
  • prime if there is excessive mildew (remove it first) or any sign of wax bleed
  • use quality exterior latex primer recommended for repaint of hardboard siding
  • do not leave a primer unpainted


c. Painting:

  • use top-of-the-line exterior 100% acrylic latex house paint in flat, satin, semigloss finish, depending on appearance desired
  • satin paints are less vulnerable to wax bleed through than are flat paints (particularly “economy” flat products)


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