Introduction
Silicone sealant plays a vital role in protecting surfaces from moisture, especially around baths, showers, sinks, and windows. But over time, even the best-applied sealant can wear out. Mould build-up, cracked lines, discolouration, or lifting edges are all signs that it’s time for a fresh seal. Leaving old silicone in place can cause problems, and proper removal is just as important as the resealing itself.
In this guide, we’ll show you exactly how to dissolve silicone sealant, the best tools and products to use, and the steps to reseal your surfaces cleanly and effectively. Whether you're working in a bathroom, kitchen, or on-site setting, this is your go-to guide for professional, long-lasting results.
When Should You Remove Silicone?
Silicone sealant doesn’t last forever. Over time, it can lose adhesion, discolour, or even harbour mould. Here’s when it’s time to act:
- Mould or Discolouration: Even mould-resistant sealants can start to fail if not cleaned regularly. Black spots, staining, or persistent mildew mean it’s time to remove and reseal.
- Cracked or Lifting Edges: If the sealant has shrunk, cracked, or pulled away from the surface, it’s no longer forming a waterproof barrier. This can lead to leaks and hidden water damage.
- Retiling or Refurbishment: If you're replacing tiles or upgrading a kitchen or bathroom, old sealant should always be fully removed before resealing; fresh sealant only bonds properly to clean, residue-free surfaces.
- Leaks and Damp Patches: Damp spots around showers, sinks, or worktops can often be traced back to failed silicone. Replacing it early can prevent more serious damage later on.
Making sure that you check your sealant and replace it when needed helps protect the structure beneath and keeps finishes looking sharp.
What You’ll Need
Before you get started, make sure you have the right tools and products to safely and effectively remove old silicone and apply a clean, lasting finish.
- Silicone Remover: Specially formulated to soften old silicone so it can be scraped away with less effort. Ideal for bathrooms, kitchens, and around windows.
- Silicone Scraper: A non-scratch scraper helps lift softened sealant cleanly from tiles and glass without damaging the surface. A sharp utility knife is also useful for slicing away thicker beads.
- Surface Cleaner or White Spirit: Essential for removing residual oils and leftover sealant before applying new. This ensures the new sealant bonds properly and gives a professional finish.
- Gloves, Cloth, & Masking Tape: Protective gloves prevent skin contact with chemicals. Cloths help with cleanup, and masking tape ensures crisp, neat edges when you apply new silicone.
- Silicone Sealant: Choose the right sealant for the job: sanitary silicone for bathrooms and kitchens, and construction-grade silicone or neutral-cure for frames, glazing, and external use.
With the right gear in hand, you’ll save time, reduce mess, and get a finish that lasts.
How to Remove Silicone Sealant
Step 1: Apply Silicone Remover
Start by applying a specialist silicone sealant remover gel directly onto the old sealant. These products are designed to soften and break down silicone, making it easier to lift away. Use a brush or nozzle to apply a generous layer, and follow the manufacturer’s instructions for dwell time – usually between 30 minutes and 2 hours.
Step 2: Scrape Away the Softened Sealant
Once the silicone has softened, use a non-scratch silicone scraper or utility knife to gently peel it away. Take your time, especially around tiles, glass, or fixtures, to avoid damaging the surface.
Step 3: Clean the Residue
After scraping, there may be some leftover residue or silicone film. Use a clean cloth and a solvent-based cleaner or white spirit to remove it. This step is crucial to ensure the new sealant bonds properly to the surface.
Step 4: Wipe and Dry the Area
Wipe the entire surface with a dry, clean cloth and leave it to air-dry completely. Any remaining moisture or chemical residue could affect the adhesion of your new sealant.
Prepping for Resealing
Once the old sealant is fully removed and the area is dry, proper preparation is key to ensuring your new silicone adheres correctly and gives a neat, long-lasting finish.
Start by making sure the surface is completely clean, dry, and free from dust, grease, or chemical residue. Any contaminants left behind can prevent the new silicone from bonding properly, leading to peeling or gaps.
For a professional-looking finish, apply masking tape along both sides of the joint or edge where you’ll be sealing. This creates a clean boundary and helps prevent smudging on tiles, worktops, or walls. Press the tape down firmly so the edges are sealed.
For best results, always test in a small area first, especially on sensitive finishes or unfamiliar materials. And when in doubt, speak to the experts in your local MP Moran branch for product advice and application support.
Replace Silicone Sealant Without Hassle
Removing and replacing silicone doesn’t need to be difficult if you’ve got the right products, a bit of patience, and a clear step-by-step approach. From dissolving old sealant to achieving a crisp, watertight finish, careful preparation and application make all the difference.
Whether you’re tackling a bathroom refit, fixing leaky joints, or resealing kitchens, MP Moran stocks everything you need. Plus, our experienced team is always on hand in-branch to help you choose the right product for your job. Shop silicone sealants and removal tools in your nearest branch or open a Trade Account for access to exclusive pricing and seamless ordering.
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