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.
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.
Coat the final strip with a final layer of resin. Wait for the resin to set firmly according to the instructions.
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.
Things You Will Need
- Fiberglass power trimmer
- Fiberglass strips
- Epoxy resin
- Marine-grade plastic filler
- Marine-grade gel coat
- It is best to use a plastic filler and gel coat that closely match the color of your hot tub. This way the repair won't stand out.