Blocking is the undesirable sticking together of two painted surfaces when pressed together (e.g. a door sticking to the jamb).
Blocking happens when a sufficient drying time has not been allowed before closing doors or windows and is more common when using low-quality semi-gloss or gloss paints.
Use a premium semi-gloss or gloss acrylic enamel paint like Dulux Aquanamel®. Low quality semi gloss and gloss water-based paints can have poor block resistance, especially in warm, damp conditions. Always follow paint label instructions and dry times. Acrylic enamel paints have a better early block resistance than vinyl latex paints.
More problem solving advice
Have you noticed small droplets appearing on your fresh coat of acrylic paint? This is known as 'surfactant leaching'. Don't panic - it's a normal part of the curing process. For each problem you’ll find a guide to identifying it, its causes and solutions.
Yellowing is the development of a yellow cast in aging solvent-based enamels. It’s most noticeable in the dried films of white paints or clear varnishes. For each problem you’ll find a guide to identifying it, its causes and solutions.