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How to silicone a gap

Person using caulking gun to silicone gap between bath tub and wall.

Overview

Silicone sealant is a great way to fill in gaps between tiles, shower screens, baths and sinks. It also stops water seeping in where you don't want it. We'll show you how to put silicone into a gap using a caulking gun. You will also see how to give your silicone a smooth, professional finish and clean up any excess.

Steps

1Apply silicone sealant to the gap

To give the silicone the best bonding surface possible, clean and dry all your surfaces before you start. Then use the caulking gun to apply silicone to the gap, working smoothly and evenly. Don't worry if it looks a bit rough, you can fix that in the next step
Person using caulking gun to silicone gap between bath tub and wall.

2Wipe off the excess silicone

Use a damp rag over the tip of your finger to wipe along the newly sealed gap. This will wipe off any excess and push sealant further into the gap to help give you a neat finish. For tight corners, use a chisel to neaten the edge. Clean off any excess with the rag.
Person using cloth to wipe away excess silicone applied between bath tub and wall.

Suggested products

Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.