How to Repair a Cracked Porcelain Laundry Sink

Chipped and cracked laundry tubs are a common problem in Australian homes. While some cracks can be repaired with a DIY approach, others will require replacement. Understanding the difference will save you time and money.

Types of Porcelain Sink Damage

Not all cracks are equal.
Small hairline cracks that are barely visible and don't penetrate through the porcelain can be repaired. These are cosmetic surface cracks.
If water is seeping through the crack or the crack is growing, replacement is your best option. These structural cracks compromise the integrity of the tub.

$Cracked ceramic bathroom sink with visible fracture near faucet and drain opening.$

DIY Repair for Minor Surface Cracks

Porcelain repair kits are available at Bunnings for around $15-$30. Brands like Selleys and White Knight provide epoxy or filler for small surface repairs.

How to Repair Minor Surface Cracks

Clean the area thoroughly- Use methylated spirits to remove all grease, soap scum and dirt. A repair will not adhere if the surface isn't completely clean.
Dry completely - Allow the cleaned area to dry fully before beginning the repair.
Apply the filler - Mix and apply the epoxy according to the manufacturer's instructions. Smooth with the applicator tool provided.
Allow to cure - Let the repair cure for the full time indicated on the package. Don't rush this step or the repair will fail.

Important to know: Porcelain repairs are rarely invisible. You can get close with colour matching, but the repair will usually be noticeable. DIY porcelain repairs are temporary solutions lasting 6-12 months under normal laundry use. For a permanent fix, replacement is recommended.

Compact laundry area with wall-mounted sink beside front-loading washing machine in white tiled room.

When Professional Replacement Is Needed

For deeper cracks or ones that penetrate the tub, replacement is your best option. Water will continue to seep through repaired structural cracks, and the repair will eventually fail under the constant water exposure and impact from heavy items in a laundry tub.
If the crack is leaking water or growing, call a licensed plumber. Structural cracks require professional assessment and replacement.
You could attempt a repair with two-part marine epoxy for deeper cracks. This adhesive is strong and waterproof. Clean the crack thoroughly with methylated spirits, dry it completely, and apply the epoxy as directed. If there's any movement in the crack, clamp or tape it together while it dries.
Once porcelain cracks, the structural integrity is compromised. Even repaired cracks are likely to fail again under normal use.
Waterproof silicone sealant can provide a temporary solution for a few months until you can arrange a proper repair or replacement. Silicone doesn't adhere strongly enough to porcelain for a permanent fix.

Replacement Options for Laundry Tubs

If you're replacing your laundry tub, consider more durable options:
Granite composite sinks are growing in popularity because of their durability. They can withstand impact better than porcelain. Granite laundry sinks offer exceptional resistance to chips and cracks compared to traditional porcelain options. These range from $200-$400 and are available from Reece Plumbing or Tradelink.
Stainless steel is another option. It's durable and easy to clean. A basic stainless steel laundry tub starts at $100-$150 from major retailers.

Modern laundry room with stacked washer and dryer, wood cabinetry, white benchtop, and stainless sink.

Cost Considerations

Porcelain repair kits from Bunnings cost around $15-$30. A basic stainless steel laundry tub starts at $100-$150, while granite composite sinks range from $200-$400. Installation costs will vary if you're not doing the work yourself.
Determine whether repairing a crack that might last 6-12 months is worth the effort, or if replacing the tub now makes more sense for your situation.

Prevention Tips

To prevent laundry tub cracks:

Don't drop heavy tools or objects in the tub
Ensure proper support during installation
Avoid leaning on the basin edge
Don't use the tub as a step stool

If your tub cracked from impact, check it was installed properly. Insufficient support underneath can cause cracking when weight is applied. If this is the case, ensure proper support when you replace the tub to prevent future problems.

When to Repair vs Replace

Repair if:

You have a minor surface crack that doesn't leak water and you're prepared for a visible repair lasting 6-12 months.
The crack is leaking water, growing in size, or structural in nature. Replacement gives you a permanent solution.

If you have a minor surface crack, try a DIY repair kit. For leaking or structural cracks, replacement is your best option. Modern laundry sinks come in various materials designed to handle the demands of everyday use better than older porcelain models. Need help assessing your tub damage? Contact a licensed plumber for an inspection.
Have you repaired a laundry tub crack yourself? What products worked best for you?

Long laundry room with integrated sink, white cabinetry, timber flooring, and washer dryer at end.

FAQs

Can a cracked porcelain laundry sink be repaired permanently?

In most cases, no. Minor surface cracks can be patched with a porcelain repair kit, but these fixes are cosmetic and temporary. Once a crack penetrates the porcelain or allows water through, the tub’s structural integrity is compromised. Even strong epoxies tend to fail over time under regular laundry use, making replacement the only long-term solution.

How long does a DIY porcelain sink repair usually last?

A DIY repair on a surface crack typically lasts around 6–12 months, depending on how heavily the laundry tub is used. Repairs are also rarely invisible, even with careful colour matching. If the crack worsens, leaks, or shows movement, the repair will fail sooner and should be replaced rather than patched again.

What’s the best replacement option if my porcelain laundry tub cracks?

If durability is the priority, granite composite and stainless steel sinks are both solid alternatives. Granite composite sinks resist impact and chipping far better than porcelain, while stainless steel offers a cost-effective, low-maintenance option. Choosing a stronger material can prevent repeat cracking and reduce the likelihood of needing another replacement down the track.