How to Remove Silicone Sealant

If your silicone sealant is cracked, mouldy or peeling away, it's time to replace it. Whether you're resealing a bath, shower, window or door, removing the old sealant properly is essential, as new silicone won't bond to old silicone.

Follow our simple step-by-step guide below.

When Should Silicone Sealant Be Replaced?

Replace your silicone sealant if you notice any of the following:

• Cracks or gaps allowing water or draughts through.
• Peeling edges that lift away from the surface.
• Hard or brittle silicone that has lost its flexibility.
• Persistent mould that keeps returning after cleaning.

If any of these signs are present, it's time to remove the old sealant before applying a fresh bead.

Step 1 – Cut Away the Old Silicone

Using a sharp knife or silicone removal tool, carefully score along both edges of the sealant and remove as much as possible.

Take care not to damage surrounding tiles, glass or window frames.

Step 2 – Apply Silicone Remover

For stubborn residue, apply Bond It De-Bond Silicone Remover using a standard cartridge gun.

Apply a generous layer over the remaining silicone and leave for 2–12 hours, depending on the thickness of the sealant.

The remover breaks down the bond between the silicone and the surface, making it much easier to remove.

Step 3 – Remove the Remaining Silicone

Use a plastic scraper to lift away the softened sealant before wiping the joint clean with white spirit.

Plastic scrapers help avoid scratching baths, glass and other delicate surfaces.

Step 4 – Prepare for Resealing

Before applying fresh silicone, ensure the joint is:

• Clean
• Dry
• Free from dust
• Free from any remaining solvent

Proper preparation helps the new sealant achieve maximum adhesion and a long-lasting waterproof seal.

Why Use Bond It Silicone Remover?

Bond It Silicone Remover is a non-drip gel that softens cured silicone, making it easier to remove.

Suitable for use on:

• Brick
• Concrete
• Glass
• Ceramic
• PVCu
• Acrylic
• Aluminium
• Steel

Always test on an inconspicuous area before use.

Frequently Asked Questions

Can you apply new silicone over old silicone?

No. New silicone will not bond properly to old silicone. Always remove the existing sealant first.

What is the best way to remove silicone sealant?

The easiest method is to remove as much as possible mechanically before using a specialist silicone remover to soften the remaining residue.

How long should silicone remover be left to work?

Bond It Silicone Remover should be left for between 2 and 12 hours, depending on the thickness of the silicone.