If you’ve had your shower re-grouted and it started leaking again within a year, you’re not alone — and it’s not a coincidence. Re-grouting is one of the most commonly sold shower repair solutions in Perth. It’s also one of the most commonly repeated ones. Here’s why.
The Problem With Re-Grouting
When a shower leaks, most tradies go straight for the grout. They scrape out the old, cracked lines, apply fresh grout, and call it done. It looks good for a few months. Then the leaking starts again.
The reason? Water doesn’t care about surface-level fixes.
Once water has been getting behind your tiles, it’s already in the substrate — the concrete base and the adhesive bed beneath the tiles. New grout on top of a wet substrate is doomed from the start. Within months, the movement of hot water, steam, and thermal expansion causes that fresh grout to crack right open. You’re back to square one. Except now you’ve paid for a repair that didn’t work.
Why the Cycle Keeps Repeating
The root cause of most shower leaks isn’t cracked grout — it’s the silicone joints at the corners and the grout lines in the wet zone that have deteriorated over time.
Standard grout is a porous, rigid material. It’s fine for filling gaps between tiles on a dry surface. In a shower — with daily temperature changes, chemical cleaners, and constant moisture — it’s under enormous stress. No grout job lasts forever in a wet area.
More critically, re-grouting only works on the surface. It can’t seal what’s already penetrated behind the tiles. And if water has already infiltrated the substrate, the problem won’t stop until the substrate itself is sealed.
What Actually Works
Professional-grade epoxy shower sealing addresses the problem at the source.
Rather than replacing surface grout, the epoxy system is flooded into the grout lines and silicone joints, penetrating and bonding within the substrate itself. It cures to form a watertight, chemically bonded seal from the inside out — not a surface coating that can peel or crack.
Epoxy is also non-porous and flexible, which means it handles the thermal movement of hot showers without cracking. Where grout eventually fails under the stress of daily use, epoxy holds.
Not All Epoxy Products Are Equal
Consumer-grade epoxy coatings — the kind available at hardware stores — are surface applications that sit on top of the tile face. They peel off within a year or two.
Professional-grade shower sealing uses a commercial-specification two-part epoxy system, applied by a trained technician. This is what we use at Surface Seal Australia — the same product used in commercial and hospitality applications where showers get heavy daily use and need to last a decade.
The Bottom Line
If you’ve had your shower re-grouted more than once and it’s still leaking, the problem isn’t the tradesperson — it’s the method. Re-grouting is the wrong tool for a substrate leak.
Epoxy sealing costs a fraction of a full retile, is completed in a single visit, and comes with a 10-year written warranty. If you’re tired of fixing the same problem over and over, book a free assessment and we’ll tell you honestly whether epoxy is the right fix for your shower.
