Also Known As: Plaster Pop, Plaster Void
Repairing cracked or chipped plaster in a pool can be a do-it-yourself project, but special tools and materials are required. Its also important to wear protective gear, including rubber boots, safety goggles and a respirator or particle mask. If repairing the pool shell, drain the water, of course. (Underwater patches are an option, but you should consult a pool professional.)
1. Use a chisel to remove any loose plaster around the cracks and divots. For larger areas, a grinder or diamond saw may be useful. Tapping a hammer along the surface can help reveal any hollow areas. Or drag a chain along the bottom of the pool, listening for echoes that indicate hollow spots.
2. Grind cracks to ½ inch deep. Extend each crack by 1 inch on each end. Use a wire brush to scrub the dust and debris from the area.
3. Acid wash the repair area. Be sure to wear a respirator.
4. Caulk cracks with self-leveling pool caulk, and let dry according to the manufacturer’s instructions. Make certain the caulk remains flush to the gunite or concrete surface.
5. Mix the pool patch according to the manufacturers instructions, being sure to add water slowly. It should be the consistency of peanut butter. Match custom colors using masonry dye.
6. Spray the repair area with water from a spray bottle, but not so much that the water beads on the surface.
7. Apply a dollop of the pool patch to the repair area and smooth with a pool trowel. Drag the trowel across the crack or chip at a 45-degree angle. Be sure to go over the area thoroughly to release air bubbles.