Paint Quality Institute

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Prep, Prime and Paint
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Hardboard

Previously Painted/To Be Painted

  1. 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
  1. 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
  1. 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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