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 paints.

SOLUTION:
• 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 paint label instructions regarding dry times. 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. Application of talcum powder can relieve persistent blocking.

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