Regular problem wax

Definition

Unsightly discoloration or a “wetting effect” on hardboard siding. The wax comes from the additives used to make the board more moisture-resistant.

Causes

  • Failure to apply the proper primer to the hardboard before painting
  • Allowing hardboard siding to weather before painting
  • Use of dark paint colors, which absorb heat and can accelerate wax bleed
  • Too little paint; wax bleeding is more likely in thinly painted areas
  • Applying a hard finish over a softer coat without priming, or painting over a glossy surface without sanding
  • Using low-quality paints, whose low levels of resin allow wax to bleed through the paint film

Solutions

  • Unprimed boards should be primed or painted within 30 days. Factory-primed boards should be painted within 90 days of installation.
  • On unprimed boards, apply the recommended primer and two topcoats. Follow the recommended film thickness application on the label.
  • Select top-quality, oxidative primers and topcoats for unprimed hardboard to help prevent wax bleeding.
  • First determine if wax bleeding is the problem:
    • Place a few drops of bleach on the discolored area. Household bleach does not affect wax so if there is no whitening or bleaching, the stain is likely wax.
    • Place a few drops of water on both normal and discolored areas. If the water beads up and runs off, a wax film probably exists.
    • Rub the area with your finger. In severe cases, the wax feels like an oily substance. a few drops of bleach on the discolored area. Household bleach does not affect wax so if there is no whitening or bleaching, the stain is likely wax.
  • Place a few drops of water on both normal and discolored areas. If the water beads up and runs off, a wax film probably exists.
  • Rub the area with your finger. In severe cases, the wax feels like an oily substance.
  • If the wax is light or moderate, the area can be cleaned with a detergent solution. In cases of severe bleeding, the surface must be cleaned thoroughly with mineral spirits. Dispose of all waste materials in accordance with local regulations.
  • Allow the surface to dry thoroughly before priming. Prime the surface with a high-quality primer and finish with the recommended Dunn-Edwards top coat.

Product Recommendations

Primer

Surface Recommended Primer
Natural Wood EZ-PRIME® Premium
Synthetic Wood ULTRA-GRIP® Premium

Exterior

Desired Finish Recommended Product
Flat EVERSHIELD® Exterior Flat Paint
Velvet EVERSHIELD® Exterior Velvet Paint
Eggshell EVERSHIELD® Exterior Eggshell Paint
Low Sheen EVERSHIELD® Exterior Low Sheen Paint
Semi-Gloss EVERSHIELD® Exterior Semi-Gloss Paint
Gloss EVERSHIELD® Exterior Gloss Paint

Please note that these suggestions are provided as a service to you. We are unable to guarantee or be responsible for the results obtained by these procedures. If you have additional questions, ask any of our expert sales associates.