Skip to content

The big you can do it sale has landed. Shop unmissable deals online & in store this spring

B&Q ClubCustomer support

How to remove and replace sealant

The silicone sealant around the tiling in the bathroom or kitchen can often get discoloured over time. It can get mouldy, particularly if the sealant is damaged or worn away and water gets in. However, this is easy to resolve by removing and replacing the sealant to restore the look of the tiling. Follow our steps below for a guide.

Materials:

Tools:

Person running a sealant remover tool along a bead of sealant to lift it off the surface.Person running a sealant remover tool along a bead of sealant to lift it off the surface.Person running a sealant remover tool along a bead of sealant to lift it off the surface.Person running a sealant remover tool along a bead of sealant to lift it off the surface.

1. Remove the existing sealant

Use a sealant remover tool to remove the existing sealant. The tool has a pointed tip to pierce the sealant and scrape it away.

2. Clean the area

If the sealant was mouldy, clean the surface with mould remover. Leave the mould remover on for as long as directed on the product instructions. Rinse off the mould remover, as directed by the product manufacturer and let the area dry thoroughly.

Close up of a bead of sealant being applied to a joint between two surfaces.Close up of a bead of sealant being applied to a joint between two surfaces.Close up of a bead of sealant being applied to a joint between two surfaces.Close up of a bead of sealant being applied to a joint between two surfaces.

3. Apply new sealant

Re-apply anti-mould waterproof sealant using the cartridge gun, applying as directed on the product instructions. Work from one end of the tiled wall to the other. Try to keep a steady pressure and speed when you're doing this.

Running the square edge of a sealant smoother tool along a bead of sealant to give it a smooth finish.Running the square edge of a sealant smoother tool along a bead of sealant to give it a smooth finish.Running the square edge of a sealant smoother tool along a bead of sealant to give it a smooth finish.Running the square edge of a sealant smoother tool along a bead of sealant to give it a smooth finish.

4. Smooth the sealant

Smooth down the sealant with a sealant smoother tool and leave it to dry. Alternatively you could use your finger to smooth the sealant, but ensure it is wet otherwise the sealant will stick to the skin.