How to Repair a Cracked Shower Tray or Bath

Table of contents:

1. Can a Cracked Shower Tray or Bath Be Repaired?
2. What You'll Need for Shower or Bath Crack Repair
3. How to Repair a Cracked Shower Tray
4. How to Repair a Cracked Bath
5. When to Replace Rather Than Repair
6. How to Find a Bathroom Fitter
7. FAQs: Bath or Shower Crack Repair

Read on for a clear breakdown of what's fixable, what isn't, and how to do the job properly if you decide to go ahead.

Can a Cracked Shower Tray or Bath Be Repaired?

The answer depends on the type of crack, the material, and what's caused it. Not all cracks are equal, and understanding the difference before you buy a repair kit will save you time and money.

• Hairline cracks: are the finest surface cracks, often barely visible until you look closely. They typically result from thermal expansion and contraction over time, minor impact, or age-related surface fatigue. On acrylic or stone resin trays, hairline cracks are good candidates for a DIY repair if the tray is otherwise solid and supported correctly.

• Stress cracks: appear near the waste outlet or along the base and usually indicate that the tray is flexing - most commonly because it isn't properly supported underneath. You'll often notice the tray feels slightly springy underfoot. Filling the crack without addressing the underlying flex will mean the repair fails. This type needs professional attention to sort the support first.

• Impact cracks: result from something being dropped, a heavy bottle, a tile off-cut, a dropped tool. These tend to be more localised and can often be repaired, depending on depth and size.

• Structural cracks: large, multiple interconnected cracks, or any crack that passes completely through the material - means the tray or bath has lost structural integrity. Repair is not the right answer here; replacement is.

Stop using the shower or bath immediately if you spot a crack. Water getting beneath the tray or bath can cause significant damage to the floor structure before any visible sign appears above.

What You'll Need for Shower or Bath Crack Repair

For a DIY repair on a surface crack, you'll need the following. Most repair kits from DIY stores cover the essentials, but make sure the product you choose is specified for your material - acrylic, stone resin, enamel, or fibreglass kits are not interchangeable.

Tools needed:

• Shower tray or bath repair kit - available from most DIY stores and online. Choose one specified for your material (acrylic, stone resin, enamel, or fibreglass). A two-part epoxy kit is the most reliable for structural durability.
• Fine-grit sandpaper - 120 grit for initial sanding, 240 grit for finishing
• Isopropyl alcohol or specialist surface cleaner - to degrease the area before repair
• Putty knife or spatula - for applying and levelling the filler
• Protective gloves and eye protection
• Colour-matched finishing polish or touch-up spray - most kits include this; if not, match carefully as there are many shades of white

The repair kit must match the tray or bath material. Using an acrylic repair compound on a stone resin tray, for instance, produces a poor bond that won't last. If you're unsure of the material, check the product documentation or contact the manufacturer.

How to Repair a Cracked Shower Tray

Before starting, give the tray a thorough clean and let it dry completely - at least a few hours, ideally overnight. No repair material will bond properly to a damp or contaminated surface.

Step 1: Assess the damage.

Clean the area and look at the crack closely. Is it surface-only, or does it pass through the tray? Press gently around it - does the tray flex? If it flexes, the support beneath is inadequate and needs addressing before any repair is attempted.

Step 2: Sand the area.

Using 120-grit sandpaper, lightly sand around the crack to create a keyed surface for the repair compound to grip. Remove all dust with a clean cloth, then wipe with isopropyl alcohol and allow to dry.

Step 3: Apply the repair compound.

Following the manufacturer's instructions, mix your two-part epoxy and work it into the crack using a putty knife, pressing firmly to ensure it fills completely. Build it up slightly proud of the surface - you'll sand it back flush once cured.

Step 4: Allow to cure fully.

Most compounds need a minimum of a few hours, but leaving the repair to cure overnight gives the strongest result. Don't rush this stage.

Step 5: Sand and finish.

Once fully cured, sand back to flush using 120 grit, then switch to 240 grit for a smooth finish. Wipe away all dust and apply the finishing polish or colour-matched spray from your kit. Allow the finish to cure for at least 24 hours before using the shower.

Note: Repair kits produce a functional result, but colour-matching isn't always perfect, especially on trays that have yellowed with age. The repair may be slightly visible in certain light. If an invisible finish matters, a professional resurfacing service will achieve a closer match.

How to Repair a Cracked Bath

The repair process is similar to a shower tray, but the material of the bath changes what products to use and whether DIY is realistic.

Acrylic Baths

These are the most common type in UK homes and the most straightforward to repair at home. The process is essentially the same as for an acrylic shower tray, clean, sand, apply a two-part acrylic repair compound, cure, sand back, and finish. Colour-matching is easier on acrylic than enamel.

Enamel Baths

The enamel surface is a glass coating fired onto metal, and a DIY repair kit will fill the crack but won't replicate the original enamel finish. For small chips and hairline cracks, a touch-up kit with colour-matched spray is adequate. For larger cracks, or where aesthetics matter, professional re-enamelling delivers a far better result.

A specialist will prime the surface, apply multiple coats of hardwearing enamel paint by spray gun, and colour-match on-site, the bath is usually usable again within 24 hours. Professional bath resurfacing typically costs £400-£700 depending on the size of the bath and the extent of the damage. See the shower cost installation cost guide if you're weighing a replacement shower tray against a full new shower installation.

Cast Iron Baths with Structural Cracks

Particularly deep cracks near the rim, waste outlet, or along the base - require specialist attention. This is not a DIY job. A heritage restoration specialist can weld and refinish cast iron, preserving baths that would otherwise need replacing.

For all bath types, approach the repair from underneath or the back of the bath where possible, as well as filling the visible surface crack, this strengthens the repair and reduces the chance of the crack propagating further. With acrylic baths in particular, once a crack has gone through the full thickness, the structural integrity of that section is compromised regardless of the surface repair.

When to Replace Rather Than Repair

Deciding between repair and replacement comes down to one question: is the crack a surface problem, or does it reflect something wrong with the tray or bath itself? A surface crack on a solid, well-supported tray is a repair job.

A crack that keeps coming back, spreads, or is accompanied by flex underfoot is telling you that repair won't hold - the underlying issue will keep generating new damage.

Replacement makes more sense when:

• The tray flexes underfoot: indicating inadequate support, which will continue to crack any repair
• There are multiple cracks, or cracks that have spread: a sign the material has reached the end of its service life
• The crack passes through the full thickness: structural integrity is gone and repair is at best temporary
• Water has already got beneath the tray: the substrate and floor structure need to be inspected and potentially replaced before a new tray goes in
• The tray or bath is very old: if it's due for replacement in the next few years anyway, a repair is money spent on borrowed time

If you're considering a full bathroom renovation rather than a like-for-like replacement, see our guide to bathroom fitting for what a full bathroom project involves.

For a cost-effective alternative to full bath replacement, see the guide to bath re-enamelling - a professional resurface at a fraction of the cost of a new bath.

How to Find a Bathroom Fitter

If you're unsure whether repair or replacement is the right route, a bathroom fitter from MyBuilder can assess the situation.

Post your job on MyBuilder, with images of the crack, to get responses from verified bathroom fitters in your area.

All tradespeople on MyBuilder undergo checks at registration - such as ID documents, company details, certifications for regulated jobs and skill assessments - allowing you to hire with confidence.

Find a bathroom fitter near you

FAQs: Bath or Shower Crack Repair

Is It Safe to Use a Shower With a Cracked Tray?

No. Stop using the shower until the crack is repaired. Even a hairline crack allows water to seep through to the floor structure beneath, where it can cause rot, mould, and damage to joists and subfloor materials. The damage accumulates invisibly and can be significantly more expensive to fix than the tray itself.

How Long Does a Shower Tray Repair Last?

A well-executed repair on a stable, properly supported tray can last several years. The longevity depends on the quality of the repair kit used, how thoroughly the surface was prepared, and whether the underlying cause of the crack has been addressed. If the crack was caused by inadequate support beneath the tray, any surface repair will fail again in time unless the support issue is fixed first.

Can You Repair a Cracked Stone Resin Shower Tray?

Yes, with the right product. Stone resin is denser than acrylic and requires a repair compound specifically formulated for it - standard acrylic kits won't bond correctly. Stone resin is also more prone to showing colour variation after repair, so if aesthetics are a priority, a professional resurfacing service is worth considering. You can browse photos of completed shower tray repairs on MyBuilder to get a sense of what professional results look like.

How Much Does It Cost to Repair a Cracked Bath Professionally?

For a professional chip or small crack repair, specialist companies typically charge £150-£250.

Full bath resurfacing where the entire surface is stripped back, repaired, and refinished with a spray-applied enamel coating costs £400-£700 for most standard baths. This is considerably cheaper than replacement when you factor in the cost of a new bath, plumbing, tiling, and installation. See our bathroom renovation cost guide for wider context on bathroom project costs.

For guidance on what to look for when choosing someone for the job, see our guide to choosing a bathroom fitter.

Should You Repair or Replace a Cracked Shower Tray?

Repair is the right call for a surface crack on a tray that is otherwise solid and well-supported. If the tray flexes, has multiple cracks, or the crack has allowed water to penetrate the floor beneath, replacement is a better investment.

A new shower tray is not a particularly expensive item; the bulk of the cost is installation, tiling around it, and any floor repairs required.