Blocking:

Undesirable sticking together of two painted surfaces when pressed together (e.g , a door sticking to the jamb.)

Possible causes:
  • Not allowing sufficient dry time for the coating before closing doors or windows
  • Use of low quality satin or gloss paint.

Remedy:

  • Use top quality satin or gloss acrylic water –based paint. Low quality water–based paints can have poor block resistance, especially in warm, damp–conditions. Follow paints label instructions regarding dry times. Acrylic water-based paints generally have better early block resistance than vinyl acetate
  • Co-polymer based develop superior block resistance over time. Application of talcum powder can relieve persistent blocking.