How to Repair a Cracked Fiberglass Bathtub

Written by stephanie daniels
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How to Repair a Cracked Fiberglass Bathtub
Save money by repairing your fibreglass bathtub instead of replacing it. (Bath Tub image by Ritu Jethani from

Cracks in a fibreglass bathtub are not just an eyesore; they also cause damage to your floor and can affect your water bill. Cracked tubs will leak water onto your floor and cause rotting that may lead to the bathtub falling through the floor. If a bathtub replacement is not in your budget, temporarily repair the cracks in the tub. The repair will take less than an hour and will allow you to use your tub again the next day.

Skill level:
Moderately Easy

Things you need

  • Towel
  • Sandpaper
  • Paint spatula
  • Epoxy sealant
  • Face mask

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  1. 1

    Turn off the water that runs to the tub. Dry the tub out completely with a towel. Doing this ensures a dry surface to work with throughout the repair.

  2. 2

    Sandpaper the areas around each crack in the fibreglass tub. Sand to create a rough spot 2 inches wide with 1 inch on each side of the crack. You will need a rough spot in order to apply the epoxy sealant.

  3. 3

    Scoop the epoxy sealant onto the paint spatula and then smooth the sealant onto the cracks. Smooth the sealant down over the crack, thoroughly covering the crack from view.

  4. 4

    Allow the epoxy sealant to dry overnight. Sand the epoxy smooth if any rough, sharp or bumpy spots are present in it. Turn the water back on and run water in the tub to rinse away sand and debris.

  5. 5

    Fill the tub above the levels of the cracks. Allow the water to sit for a few hours. Check the water level to see if it has lowered. If it has lowered, drain the tub and make sure you have covered the cracks thoroughly. If necessary, repeat the steps to cover the cracks.

Tips and warnings

  • Wear a face mask over your mouth and nose or ventilate the bathroom while applying the wet epoxy sealant to prevent dizziness and fainting.

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