Some rubber and plastics contain high levels of chemicals called plasticizers. When these are in contact with each other and other materials, such as paint, a chemical reaction can occur, which can make these surfaces feel tacky to touch. This particularly affects water-based acrylic paints.This can mean that when a door seal is pressed against the door or door jam, the painted surface and the rubber seal may stick together. This is known as blocking and can happen even when the paint is fully dried and cured.We recommend using rubber strips made from Ethylene Propylene Diene Monomer (EPDM) as door seals and draft excluders because they are less likely to be affected.
We make this very clear in our Site Work Instructions.SW 7.02 Water-borne coatingsWater-borne coatings can be sensitive to rubber containing plasticisers such as flexible PVC strips.The paint film may resolve due to these plasticisers and become sticky, it is advisable to replace such flexible strips for those made of EPDM rubber.We recommend that you seek the manufacturer’s advice regarding this problem.