Blocking

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

Possible Cause :

• Not allowing sufficient dry time for the coating before closing door or windows.
  
• Use of low quality semigloss or gloss paints.

Solution :

• Use top quality semigloss or gloss acrylic latex paint. Low quality latex paints can have poor block resistance, especially in warm, damp conditions. Follow paint label instructions regarding dry times.
• Acrylic latex paints generally have better early block resistance than vynil latex paints, or alkyd or oil-based paints, however, alkyd develop superior block resistance over time.
• Application of talcum powder can relieve persitent blocking.