Blocking occurs when two painted surfaces catch when pressed together – a door sticking to the jamb, for example.


  • Not allowing sufficient time for the coating to dry on doors or windows before attempting to close them.
  • Using low-quality satin or gloss paints. These generally have poor block-resistance, particularly in warm, damp conditions.

Always use top-quality satin or gloss acrylic water-based paint, and follow the drying times recommended on the paint label.

Acrylic water-based paints generally have better early block-resistance than vinyl acetate co-polymer-based paints or solvent-based paints; however, solvent-based paints develop superior block-resistance over time.


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