Quick Answer
Acrylic and fibreglass shower trays with cracks can be repaired using a tray repair kit (epoxy resin, filler, and a color-matched gelcoat). Soft spots indicate the supporting structure beneath has failed and the tray flexes under load, which usually requires removing the tray and rebuilding the support, a much bigger job. Stone resin trays cannot be DIY repaired and need replacement.
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Save to PinterestA broken shower tray, whether it’s cracked, leaking, or flexing underfoot, is a problem you don’t want to ignore. Water escaping through a damaged tray can seep into the floor below and cause expensive structural damage. The good news is that many shower tray issues can be repaired without a full replacement.
This guide explains how to assess the damage, repair cracks and leaks, and decide when a tray needs replacing. With the right repair kit, many cracks can be sealed in an afternoon.
Why Shower Trays Crack or Leak
Shower trays take constant weight, water, and temperature changes. Typical causes of failure include:
- Inadequate support underneath: A tray that wasn’t fully bedded on a solid base flexes under weight and eventually cracks.
- Heavy impact: A dropped bottle or tool can chip or crack acrylic and stone-resin trays.
- Failed sealant: Old, cracked silicone around the edges lets water escape behind and under the tray.
- Material fatigue: Years of use and thermal expansion can lead to stress cracks, especially in thinner trays.
Tools and Materials You Will Need
- Shower tray or acrylic repair kit
- Fine-grit sandpaper
- Cleaning cloth and rubbing alcohol
- Silicone sealant and sealant gun
- Utility knife
- Masking tape
- Filler applicator
Step-by-Step: How to Repair a Shower Tray
Step 1: Clean and Dry the Area
Thoroughly clean the cracked area and wipe it with rubbing alcohol so the repair compound bonds properly. The tray must be completely dry before you start.
Step 2: Prepare the Crack
Lightly sand around the crack to key the surface. For a hairline crack, you may drill a tiny stop-hole at each end to prevent it spreading.
Step 3: Apply the Repair Compound
Mix and apply the filler from a shower tray or acrylic repair kit, pressing it firmly into the crack and smoothing it level with the surface. Follow the kit’s curing time exactly.
Step 4: Sand and Finish
Once cured, sand the repair smooth with progressively finer grit until it is flush and blends with the surrounding tray. Many kits include a finishing or color coat.
Step 5: Reseal the Edges
Cut out any old, failed silicone around the tray and apply a fresh, neat bead of bathroom-grade sealant to stop water escaping at the joints.
Pro Tips to Prevent This Problem
- Check that your tray is fully supported underneath; flexing will crack any repair.
- Use bathroom-grade silicone with mold inhibitors for long-lasting seals.
- Address cracks early before water reaches the floor structure below.
When to Call a Professional
Call a professional if the tray flexes significantly, the crack keeps returning, or you see signs of water damage in the ceiling or floor below. These indicate poor support or hidden leaks that need proper investigation, and often a full tray replacement.
Frequently Asked Questions
Can a cracked shower tray be repaired?
Yes, many surface and hairline cracks can be filled and refinished with a repair kit. Deep cracks or a flexing tray usually need replacement.
Why does my shower tray flex when I stand on it?
It was likely not bedded onto a solid base during installation. Flexing will crack any repair, so the support underneath must be addressed.
How do I stop my shower tray leaking at the edges?
Remove the old silicone completely and apply a fresh bead of bathroom-grade sealant. Most edge leaks come from failed sealant rather than the tray itself.
Final Thoughts
A broken shower tray can often be saved with a proper repair kit and fresh sealant, sparing you the cost and disruption of a full replacement. Just remember that lasting repairs depend on a tray that is fully supported underneath. Fix cracks promptly, reseal the edges well, and you will keep water where it belongs and protect the room below.