How to Seal Around a Bathroom Sink Newly installed sinks will require sealing; as will old sinks that may have become loose from the wall over time. Our step-by-step guide will help you seal your sink with a professional finish.

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Step 1: Clean Area

• Ensure the area is clean and dry with no soap residue on, around or behind the basin.

Step 2: Apply Silicone Sealant

• Cut the tip of the silicone sealant tube to the width of the crack between the basin and the wall.

• Insert the tube into the mastic gun and pull the trigger until the silicone begins to come out.

• Wipe away excess.

• Using a steady, even stroke, apply the silicone in a thick bead deep into the crack between the sink and wall.

Step 3: Smooth Out Sealant

• Prepare a solution of 50% washing up liquid and 50% water.

• Dip your finger into the solution and gently run your wet finger over the bead of silicone until the silicone is smooth.

• This will leave a smooth, professional finish.

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