Commonly known as soft soap this waterbase soap is essential in plaster mold making to ensure multiple cast plaster mold sections and the mold formwork box are easily released. Initial application best dilute with water in 1 part soap to 1 part water for better absorption into the plaster. Subsequent application need not be diluted. Work with a shaving brush to coat well all details of the master or parts to cast but ensure the internal surface of the mold for slip casting are free of soft soap as it hinder slip water absorption. Lightly buff the soaped surface before casting the next section.
In leather tanning, soft soap helps to lubricates fibres and clean up leather surfaces. Dilute the soft soap with water into a foamy solution and brush on to leather both surfaces with a shaving brush for absorption.