Plasterers prepare and finish walls and ceilings in homes, commercial premises and other buildings. Their work may include applying plaster to brickwork or blockwork, skimming over existing surfaces, repairing cracks and damaged areas, and covering joints in plasterboard. They usually assess the condition of the surface first, then remove loose material, apply suitable primers or bonding coats and build up the finish in layers. Some also fit plasterboard, create partition walls, install coving or form decorative details. External plastering services can include rendering and repairing the outer faces of buildings, using finishes selected to suit the background and exposure. Plasterers may work on new builds, renovations and extensions, and can advise on drying times and how to prepare a surface for painting or wallpapering. Customers typically agree the areas to be covered, the finish required and whether existing coverings or debris need to be removed.