Some plaster repairs can be more superficial in nature. Here the layers of paint as well as the finish layer of plaster where damaged from a leaking steam radiator on the floor above. The pink product seen in the photo is a plaster bonding agent which is applied prior to the first coat of plaster. This is and proven old fashion method and will lock the new product to the old, Several additional coats of Plaster of Paris are applied before a light sanding. The plaster repair will then be ready for primer. As you can see LPR uses plastic to mask off the area to ensure a clean work site and keep the rest of your home free of contaminates.