- 1). Drain the water from the pool using a garden hose. Suck into the end of the hose until water begins to come out. Let the pool completely dry out.
- 2). Sand a square-foot area around the leak using 80-grit sandpaper. Scuff the surface until it's completely dull, and sand the edges of the leak smooth.
- 3). Clean the sanded area using a rag and acetone. Remove any grease or dust that is on the effected area.
- 4). Put on rubber gloves and mix the fiberglass filler with the catalyst as directed on the containers. Use a small bucket and a stir stick to thoroughly mix the filler.
- 5). Apply the filler to the leak using a putty knife. Smooth the filler out so it's level with the surrounding fiberglass. Let the filler harden.
- 6). Sand the filler using 200-grit sandpaper and a palm sander. Sand it until the edges of the filler blend in with the pre-existing fiberglass. Clean the surface with the rag and acetone.
- 7). Pour the gel coat into a small bucket and add the hardener, following the recommendations on the containers. Use a stir stick to mix the gel coat.
- 8). Apply two coats of gel coat to the repair, using a felt roller. Let the first coat become tacky before applying the second coat. Let the gel coat harden for 24 hours.
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