Yes, you can repair a fiberglass shower yourself. Clean and dry the damaged area, sand around the crack or chip, fill it with a fiberglass or gelcoat repair kit (adding fiberglass mesh for larger holes), let it cure, then wet-sand smooth and polish so it blends in. Small chips and hairline cracks are easy DIY fixes. If the floor flexes or the crack keeps coming back, the shower base needs support underneath—or replacement.
What You’ll Need
- Fiberglass/gelcoat repair kit (color-matched to white, almond, or bone)
- Fiberglass mesh or cloth (for holes)
- Sandpaper (from 220 up to 1500–2000 grit wet/dry)
- Acetone or rubbing alcohol, rags, painter’s tape
- Plastic spreader, gloves, mask, and ventilation
- Rubbing compound and polish
How to Repair a Fiberglass Shower Step by Step
- Dry the area completely—don’t use the shower for a day beforehand.
- Clean with acetone or alcohol to remove soap residue.
- Drill a tiny hole at each end of a crack (optional) to stop it spreading.
- Sand around the damage to roughen the surface for bonding.
- For holes: layer fiberglass mesh with resin from the kit.
- Mix and apply the filler/gelcoat, overfilling slightly, and tape over it if the kit says to.
- Let it cure fully per the kit instructions.
- Wet-sand from coarse to fine grit until flush.
- Polish with rubbing compound to restore shine.
Why Fiberglass Showers Crack
- No solid support under the base (gaps or settling)
- Heavy impacts (dropped bottles, tools)
- Age and UV exposure
- Harsh, abrasive cleaners wearing the gelcoat
Flexing floor? If the base moves or creaks when you stand on it, the crack will return. A pro can inject expanding foam or mortar under the base through small holes before repairing the surface.
Repair vs Replace
Pros
- Repair kits are inexpensive and quick
- Good results on chips and small cracks
- Avoids tearing out walls and plumbing
Cons
- Color match may not be perfect on older, yellowed units
- Won’t fix structural flexing alone
- Large, spreading cracks often need replacement
What Not to Use on a Fiberglass Shower
- Abrasive powders, steel wool, or scouring pads
- Strong solvents like paint thinner on finished surfaces
- Harsh acidic cleaners left for long periods
For everyday cleaning tips, see how to clean bathroom tiles.
Frequently Asked Questions
Can you repair a fiberglass shower?
Yes. Chips, scratches, and small cracks can be repaired with a fiberglass or gelcoat repair kit.
How much does it cost to replace a fiberglass shower?
Replacement costs much more than a repair kit because it involves removing the old unit, plumbing work, and often wall repairs. Get local quotes.
Does Home Depot have a fiberglass shower repair kit?
Most home improvement stores sell fiberglass and porcelain tub and shower repair kits in common colors.
What not to use on a fiberglass shower?
Avoid abrasive powders, scouring pads, steel wool, and harsh solvents, which scratch or dull the gelcoat.
How long does a fiberglass repair take to cure?
Usually several hours to overnight, depending on the kit and temperature. Wait the full time before using the shower.
