How to make a silicone sealant joint

Applying silicone sealant correctly creates a clean, watertight finish around kitchens, bathrooms and fittings.

What you’ll need

Silicone sealant, caulking gun, masking tape, smoothing tool or gloved finger, cleaning wipes, utility knife.

1. Preparation

• Remove all old sealant before applying new silicone.

• Clean and dry the joint thoroughly.

• Apply masking tape along both sides of the joint if required.

• Cut the nozzle at a 45° angle and load into the gun.

2. Application

• Apply a steady bead of silicone at a 45° angle, ensuring the joint is fully filled.

• Work smoothly and consistently along the joint.

3. Finishing

• Smooth immediately using a damp finger or smoothing tool.

• Remove masking tape before the sealant skins.

• Allow to cure fully (typically 24–48 hours) before exposure to water.

Key tips

• Use the correct sealant for the application.

• Ensure surfaces are completely dry.

• Work in short sections for best results.