Why You Should Never Apply New Silicone Over Old Silicone
If the silicone in your shower is mouldy, cracked, or peeling, it’s tempting to grab a tube of sealant and just run a new bead over the top. Quick fix, right?
Not quite.
Applying new silicone over old silicone may seem like a time-saver, but it rarely solves the problem—and can actually make things worse. Here’s why proper silicone removal is a critical first step in restoring your shower and protecting your home from water damage.
1. Silicone doesn’t bond well to silicone
Silicone sealant is designed to stick to clean, dry surfaces—not to itself. If you apply fresh silicone over old material, the new layer won’t adhere properly. This leads to uneven application, gaps in coverage, and peeling over time.
Bottom line: It may look sealed, but it won’t be watertight.
2. You’re trapping mould, bacteria, and moisture
Old silicone is often hiding more than just wear and tear. If there’s mould, mildew, or moisture underneath, sealing over it simply locks it in—allowing it to spread behind the scenes.
Over time, this can cause staining, odours, and even affect your indoor air quality.
3. It creates a messier, more noticeable joint
Layering silicone results in an uneven, bulky finish that can look messy and unprofessional. You might end up with visible ridges, poor corner alignment, and awkward bulges that ruin the clean lines of your shower.
4. You’re not fixing the problem—just covering it
In most cases, worn-out silicone is a symptom of deeper issues—like tile movement, poor drainage, or hidden leaks. Skipping the removal process means missing the opportunity to inspect the area and address potential water damage early.
What’s the right way to reseal?
✅ Step 1: Remove all old silicone carefully using professional tools
✅ Step 2: Clean and dry the area thoroughly
✅ Step 3: Inspect for mould or water damage
✅ Step 4: Apply new, high-quality mould-resistant silicone
✅ Step 5: Let it cure fully for a watertight seal
At Leaking Showers Sealed, we specialise in removing silicone from tiles properly—and resealing your shower the right way, so you don’t have to revisit the problem again in six months.
Want a longer-lasting fix?
Don’t settle for a cover-up.
👉 Contact us today for professional silicone removal and resealing that actually works—and lasts.