Undesirable sticking together of two painted surfaces when pressed together (e.g. a door sticking to the jamb).
Use a premium semi gloss or gloss waterbased enamel paint. Low quality semi gloss or gloss waterbased paints can have poor block resistance, especially in warm, damp conditions. Follow the paint label instructions regarding drying times. Waterbased enamel paints have better early block resistance than oil based paints.
Source: The Paint Quality Institute
Aalto recommends Aalto WB Enamel Gloss or Semi Gloss.