Close up image of a wood with peeling paint and underneath is another coat of a different color.

Paint Incompatibility – EXTERIOR

Loss of adhesion where a water-based topcoat is applied over many old coats of alkyd or oil-based paint.

Causes

  • Use of water-based latex paint over multiple coats of old alkyd or oil-based paint causes the old paint to “lift-off” the substrate.

Solutions

  • Remove the existing paint and prepare the surface – cleaning, sanding, and spot-priming where necessary – before repainting with a top-quality latex exterior paint. Follow appropriate safety precautions if the old paint may contain lead.
  • Prime any bare surface with a high-quality primer and allow it to dry thoroughly.
  • Paint with high-quality paint in the desired finish.

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