Paint With Confidence
Exterior Common Issues & Solutions
Text & image courtesy of the Rohm & Haas Paint Quality Institute
Blocking
Undesirable sticking 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 doors or windows.
- Use of low quality semi-gloss or gloss paints.
Solution
Use top quality semi-gloss 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 vinyl latex paints, or alkyd or oil-based paints; however, alkyds develop superior block resistance over time. Application of talcum powder can relieve persistent blocking.
