can this be used to set tape in damaged corners of plaster walls?

Thank you for posting your inquiry on the DAP Plaster of Paris. This formula is specifically designed for fast setting characteristics that would make your described application challenging. As indicated on the product package label and supporting product literature: "Working Time: 6-10 minutes, Set Time: 30 minutes and Mix only the amount of product needed for immediate use." Should you have additional questions or require further assistance, please contact DAP’s Technical Customer Service Department at 888-327-8477.