How to Repair Cracked Hot Tubs

No matter how careful you and your guests are, it's always possible that an accident or moment's lack of care can lead to damage in a hot tub. When this happens, cracks can develop. This does not have to render the hot tub unusable, as it is relatively simple to repair cracked hot tubs in a few hours. Knowing how to repair cracked hot tubs yourself lets you patch a small crack without the expense of calling out a professional and it often is a lot quicker.

Many cracks in hot tubs can be repaired quickly.
  1. Drain all the water from the hot tub and allow it to dry thoroughly overnight.Drill a hole at one end of the crack, then drill another hole at the other end to prevent the crack from getting longer. Cut the fiberglass into six strips of varying lengths with a fiberglass power trimmer, starting small and getting increasingly long until the final strip overlaps the crack by a few inches on each end.

  2. Prepare the epoxy resin according to the instructions provided. Apply a small amount of the resin to the crack, using the paintbrush. Apply the smallest fiberglass strip to the crack. Coat the strip in resin. Apply the next strip to the crack, overlapping with the first strip. Apply the strips over each other and paste each one with epoxy resin.

  3. Coat the final strip with a final layer of resin. Wait for the resin to set firmly according to the instructions.

  4. Sand the repair down to provide a smooth surface. Coat the repair with a layer of marine-grade plastic filler. Wait half an hour for the filler to dry. Sand the repair down to provide a smooth surface. Paint with gel coat and a paintbrush. Sand down again.


  • Always thoroughly drain your hot tub before attempting repairs, especially repairs involving the use of electrical equipment such as drills. Putting devices powered by main electricity in contact with water can result in serious injury or even death, and getting battery-powered devices wet can damage or ruin them.