Expanding joint filler foam is made by mixing chemicals that create a reaction, thus forming a foam substance. This foam is used to fill holes and gaps in material such as concrete. Expanding joint filler foam contains a very powerful adhesive, which helps to form a solid bond with the concrete or any other materials that it might come in contact with, such as skin. Removing expanding joint filler foam from skin takes some time and effort, but it can be done.
Use a dry rag to wipe expanding joint filler foam from the skin immediately after it has had contact with the skin's surface. Be sure to remove as much of the expanding foam as possible, as quickly as possible. The longer the expanding joint filler foam sets on the skin the harder it will be to remove.
Soak a rag with a mild solvent such as acetone and wipe the area of skin that has come in contact with the joint filler foam. Mineral spirit can also be used, in place of acetone.
Wash the area with soap and water repeatedly. It is best to soak the skin in a bathtub or shower for an extensive period of time and scrub the area with soap, this will help loosen the adhesive bond from the skin.