Replastering a pool is certainly not a five-minute job, but that doesn't mean it's not a job you can DIY. The average gunite swimming pool will need replastering every seven to 12 years, depending on the way in which it was installed and on how well it’s been maintained.
One reason to replaster is cosmetics as it’s possible for the walls of a pool to become discolored quickly. If the walls of your pool look brown or green instead of the clean blue you desire, you might consider undertaking the replastering work straight away. Follow these 11 steps and you should have a beautifully replastered pool that will be the envy of the neighborhood.
Step 1 - Use the Sump Pump
Turn off all working equipment and drain the swimming pool. Use the sump pump to clear any water that remains at the bottom.
Step 2 - Clean
Clean the drained pool of dirt and debris such as leaves. Use the sponge and an ecologically friendly solution to clean the pool.
Step 3 - Address Problem Areas
Identify problem areas where the plaster is peeling significantly. Pay special attention to edges and corners.
Step 4 - Use the Chisel
Take loose plaster away with the chisel or a putty knife.
Step 5 - Sand
Sand sharp edges where the plaster has been removed to make re-plastering easier. Sand at least twice so that the area is neat and clean.
Step 6 - Spray Acid
Pour or spray an acid wash over the surface. Use an acid brush to spread it effectively. This will render the new surface conducive to accepting new plaster.
Step 7 - Use the Hose
Rinse away the acid wash with a hose and allow the surfaces time to dry. Once done, apply a bond coat for replastering using a roller. Let this dry overnight.
Step 8 - Apply Plaster
Prepare the plaster to be used according to the manufacturer’s instructions, then apply it using the steel trowel. Starting at the deepest end of the pool, ensure that the plaster you apply has a thickness of 3/8 inches. Be careful not to apply wet plaster to set plaster and fill in any cracks or holes. Ensure an even surface. Now, let the plaster dry.
Step 9 - Finish
Mix the plaster finish and again use the trowel to apply it evenly at a thickness of 1/4 inches.
Step 10 - Check
Inspect your work for any flaws and wait for the plaster to dry completely.
Step 11 - Paint
Apply specially produced pool paint. Make sure you cover the entire surface and apply the paint evenly. Use the brush in one direction so as to give a smooth finish. Don't use the pool until the paint dries up properly.
Now, refill the pool, chlorinate the water, and enjoy the benefits of your hard work.