Yellowing of fresh paint

 

A yellow colour which appears on the coating during the application or drying process.

A yellow colour which appears on the coating during the application or drying process.

Causes

  1. Type of gypsum boards (drywall). New types of gypsum boards on the market occasionally complicate results obtained with various paints. Some recycled boards from the United States will turn yellow when covered with a primer-sealer and a latex paint. All the sections covered with a joint compound stay white, while the rest turns yellow.
  2. Apartment improperly heated.
  3. Joints poorly dried.
  4. Lack of ventilation.
  5. Use of varnishes that harden in a humid environment, causing the vapours to settle down on the paint. Fresh water-based paints when applied before a floor varnish will quickly turn yellow following the application of urethane-based varnishes which harden when expose to humidity. Their strong smell makes them easily recognizable.

Solutions

  1. Clean the surface, apply a coat of primer Polyprep145-033, and then apply the finishing product.
  2. In the case of humid gypsum, heat up the apartment and the yellowing will eventually disappear.
  3. The blackening of joints indicates a mildew problem. In such a case, reapply a joint compound on the surface before repainting. Otherwise, let joints dry completely before painting, apply a coat of primer Polyprep145-033, and then apply the finishing product.
  4. Ventilate the room, apply a coat of primer Polyprep145-033, and then apply the finishing product.
  5. Clean the surface, apply a coat of primer Polyprep145-033, and then apply the finishing product.
If you apply a varnish that hardens in a humid environment, leave the house for a few days, and remove plants and perishable foods. When you return home, make sure to properly ventilate the room(s).