If you’ve ever peeled back a strip of blackened silicone in your shower and wondered how it got that bad, you’re not alone. Melbourne’s swing between humid summers and cold, damp winters puts a lot of pressure on shower sealant, and older housing stock in suburbs like Brunswick, Footscray and Camberwell doesn’t always help matters either. The good news is that a bit of regular care goes a long way toward keeping your shower sealant doing its job properly, rather than turning into a mouldy strip you’re embarrassed to show guests.
Below are seven things you can do at home to get more life out of your shower sealant, along with a few signs it’s time to call in a professional for a proper reseal.
1. Sort Out Your Bathroom Ventilation First
Before you even think about the sealant itself, check how your bathroom handles moisture. Poor airflow is the number one reason silicone breaks down early, because trapped steam sits on every surface, including the grout and the silicone sealant for tiles around your shower recess.
If you’ve got an exhaust fan, run it during your shower and for a good 15 to 20 minutes afterwards. No fan? Cracking a window, even in winter, makes a real difference. Older Melbourne homes with limited ventilation are exactly where you’ll see shower silicone sealant fail first, often within a couple of years instead of five or more.
2. Wipe Down the Shower After Every Use
This one takes about thirty seconds and it’s the single easiest habit for protecting any sealant for shower recesses, hobs and corners. Standing water left to evaporate on its own leaves behind soap scum and mineral deposits, and both accelerate mould growth on silicone.
Keep a squeegee or an old microfibre cloth in the shower and give the tiles, glass and sealant a quick once-over before you get out. It sounds fussy, but it’s genuinely the habit that makes the biggest difference to how long your shower sealant stays white and flexible.
3. Clean It With the Right Products, Not the Harshest Ones
It’s tempting to reach for whatever bleach-based spray is under the sink, but strong chemical cleaners can actually break down the surface of bathroom silicone sealant over time, making it more porous and easier for mould to take hold. Abrasive scourers do similar damage by scratching the surface.
Stick to a mild, pH-neutral bathroom cleaner and a soft cloth or an old toothbrush for the grout lines. If mould has already set in, a diluted vinegar solution or a purpose-made mould spray applied sparingly is usually enough, without stripping back the bathroom silicone sealant underneath the surface staining.
4. Choose a Quality Sealant When It’s Time to Reseal
Not all silicone is created equal. Cheap, generic tubes from the hardware store often lack the mould inhibitors and flexibility that proper wet-area products have. When you’re resealing, look for a purpose-made silicone bathroom sealant with built-in mould resistance and a neutral cure formula, which is gentler on tile grout and less likely to yellow over time.
This matters just as much for silicone sealant for tiles as it does for the joint between the shower base and the wall. A better-quality product costs a little more upfront but tends to outlast a budget option by years, not months.
5. Don’t Wait Until It’s Falling Apart to Reseal
Most shower sealant has a working life of somewhere between five and ten years, depending on how well it’s maintained and the conditions in your bathroom. The mistake a lot of homeowners make is waiting until there are visible gaps, black mould, or peeling edges before doing anything about it.
By that point, water has usually already found its way behind the silicone and into the substrate, which is a much bigger and more expensive problem than a simple reseal. If your shower sealant is starting to discolour or feel less flexible than it used to, treat that as your cue to book a reseal rather than waiting for it to fail.
6. Deal With Leaks and Pooling Water Early
Standing water anywhere near your shower sealant is bad news, whether that’s a slow leak from a tap, a shower screen that doesn’t drain properly, or a floor with poor fall to the drain. Constant moisture exposure is one of the fastest ways to break down shower sealant, even the good stuff.
If you notice water pooling in a corner, a section of silicone that stays damp long after everyone’s finished showering, or a faint musty smell, it’s worth getting it looked at sooner rather than later. Small plumbing or drainage issues are usually straightforward to fix, but they’ll keep undermining your shower sealant or the grout around it until they’re sorted.
7. Know When to Call In a Professional
DIY resealing looks simple enough on YouTube, but it’s easy to get wrong. Common mistakes include not fully removing the old silicone before applying new, trapping moisture underneath the fresh bead, or skipping proper surface preparation, all of which lead to mould reappearing within months rather than years.
A professional reseal typically involves stripping back to bare tile and grout, thoroughly drying and cleaning the area, and applying a fresh, even bead of quality sealant with the right tools for a clean finish. If your bathroom has widespread mould, multiple problem areas, or you’ve already tried a DIY fix that didn’t hold up, it’s usually more cost-effective in the long run to get it done properly once.
Frequently Asked Questions
How long does shower sealant last?
Most shower sealant lasts somewhere between five and ten years, though this varies a lot depending on ventilation, cleaning habits and the quality of the original silicone used.
Can you reseal over old sealant for shower recesses?
It’s not recommended. Applying new silicone directly over old sealant traps moisture and bacteria underneath, which usually leads to mould reappearing quickly. The old sealant should always be fully removed first.
Why does mould keep coming back on the silicone even after I clean it?
Usually because moisture is trapped, not gone, often from poor ventilation or mould sitting beneath the surface. If it returns within weeks, the silicone likely needs replacing, not cleaning.
How long should I wait before using the shower after resealing?
At least 24 hours, though it pays to check the product’s instructions. Using it too soon stops the silicone curing properly and shortens its lifespan.
Is it worth patching just one small section instead of doing the whole shower?
Only as a short-term fix. It rarely blends in, and if more than one area is wearing, it’s usually more efficient to redo the whole run at once.
Final Thoughts
None of these tips require major renovation work or a big budget, just a few small habits and knowing when to step in before a problem gets worse. Good ventilation, a quick wipe-down after every shower, gentle cleaning products and choosing a decent silicone bathroom sealant when it’s time to reseal will all add years to the life of your shower sealant.
If your bathroom’s sealant is already past saving, or you’d rather leave the job to someone who does it properly the first time, get in touch with Black Diamond Caulking for a resealing assessment. A fresh, professionally applied bead of shower sealant is a small job that makes a surprisingly big difference to how your bathroom looks and functions.