Fixing Fiberglass Tub Crack The Best Guide 2023

Today let’s check our fixing fiberglass tub crack guide. Fiberglass tubs can develop stress, hairline, and spider cracks from frequent use, inadequate support, harsh cleaners, and heavy objects hitting the tub and dropping it. These small cracks can become larger cracks, which can lead to leaks and ultimately the bathtub breaking apart. Luckily, you can fix hairline cracks on fiberglass tubs quite easily.

Dry the crack and then sand it using fine-grit sandpaper. Use a fiberglass filler and an adhesive to seal the crack. The epoxy mixture should be applied to the crack. Next, sand the area. To fix a fiberglass tub’s hairline crack, apply more epoxy and sealer.

Acrylic and fiberglass bathtubs both are made from fiberglass, so the process for fixing cracks is nearly the same. These steps can be used to repair acrylic tubs, fiberglass tubs, or fiberglass shower pans.

How Do You Fix A Crack Inside A Fiberglass Tub

Fixing Fiberglass Tub Crack The Best Guide 2022

Fiberglass is a stronger and more durable option than traditional ceramic and metal showers and tubs. Unsightly cracks can form in tubs that are not supported or have been subjected to abuse and heavy use. If left untreated, these cracks may become deeper or larger holes in the walls and floor of your tub. These cracks can be fixed with a basic fiberglass repair kit.

Here are some steps to repair cracks in fiberglass tubs:

1. Use a sponge or rag to apply the household cleaner to the crack. Rinse the area with water, then dry it with a towel or rag.

2. Use fine-grit sandpaper to lightly sand the area around the hairline crack. Use a rag to remove any sanding dust.

3. Use the fiberglass adhesive or bonding agent included in your kit to fill the crack. You can use the included brush or a smaller paintbrush. You should cover the crack and leave a 1-inch gap around the area that is damaged. Before proceeding, let the bonding agent dry according to the package repair kit instructions.

4. Fill the crack with fiberglass glue. Use a putty knife to apply the fiberglass filler. Next, scrape the tub’s surface and surrounding tub surface with the knife in order to remove any excess putty. Before you proceed with the repair, allow the putty to dry completely.

5. Use fine-grit sandpaper to sand the patched areas. Continue to sand until the patched area is flush with the tub’s surface. Use a sponge or rag to remove the sanding dust.

6. Mix the epoxy gel coating from your repair kit.

7. Apply the gel coat using a paintbrush to patch the area. You can paint the crack and a 2-inch surrounding area.

8. To fit the area of paint, cut a piece from fiberglass cloth. Use your hands to press the cloth into the epoxy gel coat. Use your fingers to smoothen the fiberglass cloth against the tub wall.

9. Apply the epoxy gel coat to the fiberglass cloth again.

10. Use a paintbrush to apply the sealer or finish coat that was included with your repair kit.

Fiberglass Tub Repair Kit

Fiberglass Tub Repair Kit

The fiberglass tub repair kit includes all the chemicals and tools you need to repair a damaged or cracked fiberglass surface. It can be used on bathtubs or other fiberglass surfaces to repair the affected areas.

The fiberglass tub repair kit includes a fiberglass cloth, resin, and brush as well as a hardener, mix tray, stick, spreader, and a hardener.

These kits can be used to repair fiberglass tubs:

Surface Fiberglass Repair Kit

This kit contains tape or paint made from polymer-based materials to seal cracks in fiberglass bathtubs’ outer surfaces.

Kit For Internal Repairs

You can use glue or paste from the internal repair kit to fill in the cracks. Find them on Amazon.

The depth of your crack in the bathtub will determine which option you choose.

What Does Fiberglass Tub Repairs Cost?

What Does Fiberglass Tub Repairs Cost?

The cost to repair a fiberglass bathtub varies depending on its condition.

It all depends on whether you hire someone to do the job or you do it yourself. For hairline crack repair, professional plumbers charge between $100 and $160 per hour.

Is It Possible To Repair A Cracked Bathtub With A Flex Seal?

Flex Seal has no structural value and cannot fix cracked bathtubs.

It can stop a leak but the fiberglass cracks that are still under it will grow.

What Causes Hairline Cracks In A Fiberglass Tub?

What Causes Hairline Cracks In A Fiberglass Tub?

These cracks are most commonly caused by the use of harsh cleaners, inadequate support, and bathtub aging.

Hairline cracks can also be caused by hitting tubs with heavy or sharp objects.

Look also – Toilet Tank Bolts Leaking – Fixing Guide 2022


Fiberglass bathtubs can be both practical and beautiful. These bathtubs are made of epoxy resins and are susceptible to damage like hairline cracks.

If you want to install a fiberglass tub in your bathroom, you will need to know how you can fix it.

Fixing Fiberglass Tub Crack FAQs

Can a crack in a fiberglass tub be repaired?

No matter how severe a crack or indentation might appear, it’s still the same process as if it were a small pit. It’s simple in both cases. Using a basic epoxy kit and a few other essential items, you can repair a fiberglass tub in as little as a day. The compound will dry quickly.

Can a cracked bathtub be repaired?

You can repair a bathtub crack or chip. Cracks and chips can become more severe over time. This article will show you how to fix it yourself, or with the assistance of a professional.

Can an acrylic tub crack be repaired?

Multitech Products says that if your acrylic or fiberglass bathtub cracks, it can be easily repaired with a bathtub repair kit, which is available at your local hardware store. You will need to patch any cracks larger than 1/4″.

Can a fiberglass shower crack Be Fixed?

Fill the crack or hole with a fiberglass/acrylic repair tool. This is a quick and economical solution. These materials are similar to compounds used in car body repairs as fillers. An automotive body filler can also be used to repair sinks, toilets, and tubs.

About Post Author

Leave a Comment