Sealing a new, or even an old, bath or shower area doesn’t have to be a hassle. Take a look through this guide to discover how you can add or replace bathroom sealant to your new bathroom feature.

Table of contents:

What you need

Safety equipment (gloves and glasses)
Masking tape
Safety knife or flat-headed screwdriver
Caulking gun
Silicone sealant
Silicone applicator or a round headed tool

How to apply sealant to a bath

Read through these simple steps to understand how to use bath sealant to ensure your bath not only contains water but has a clean design too.

Please note: Ensure that the area is clean before application – removing all old sealant and ensuring dirt, grease etc is removed.

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Step 1: Planning for the sealant

Use masking tape to mark where you’re going to put the silicone around the edge of the bath. Keep the tape at least 3mm from the wall and work from the corner furthest from your bathroom door. Once this has been done, you’ll need your safety equipment from here on out.

Planning for the sealant

Step 2: Filling the bath

Fill the bath with water and leave it filled. This can help you neatly apply the sealant, help you test the strength of the sealant, and give you a true idea of whether or not the sealant will work when the bath is in general use following application. Keep in mind sealant can take up to 24 hours to set, so ensure you don’t allow the use of the bath or shower bath until the sealant is dry and leave the bath filled with water.

Filling the bath

Step 3: Preparing the sealant

Use a knife to cut the silicone sealant open. Cut the tip as close to a 45-degree angle as possible and attach the head or nozzle of the silicone. You can then put the silicone in a caulking or silicone gun and move on to applying the sealant.

Step 4: Applying the sealant

Get close to the bath, as close as you can, where you plan to apply the sealant. Like with the tape, start with the corner furthest away from the door as this will ensure you don’t touch new silicon put down.

Example: for a bath surrounded by three walls, use a ‘C’ motion going from the ‘top’ of the bath.

You can now begin to apply the silicone solution with the caulking gun – apply silicon to both the base and the wall if possible.

Applying the sealant

Step 5: Flattening the sealant

Lumpy sealant just makes for an unpleasant appearance and can risk increased build-up of dirt within the tiny grooves or behind the sealant. Using a wet round ended tool (or sealant applicator if you have one), smooth out the sealant at an angle so that the sealant can support the watershed back into your bathtub.

Note: Remember not to let the bath or shower be used during the 24-hour setting time and leave the bath filled until the sealant has set.

Flattening the sealant

Your brand-new sealant is applied! Enjoy your fresh, new sealant and know your bath can now drain successfully.

Final results

Step 6: Adjusting the bath

Some bathtubs might not be as close to the wall and as such will need adjustment. Sealing the larger gaps between a bathtub and a wall can be done. Simply remove silicone or grout (if any) already there and move the bath closer to the wall. You can now seal the bath as normal.

If you decide not to adjust the bath’s position, there are two things you can do.

Method 1

Plug the gap with an adhesive and bonding material – once dry, seal the bath as normal.

Method 2

Use flexible caulking strips (self-adhesive tape) by cutting the tape to the required length and gap size, then peel off the backing and press the strip into the place where the gap needs to be covered.

How to remove sealant from a bath

Remove existing sealant (whether it may be damaged, old or covered in mould) by cutting it with a knife (preferably a ‘safety’) and then lifting and scraping it away with a flat-headed screwdriver.

Removing the old sealant

If there are any remaining strands of sealant, you can remove the leftover sealant using your finger, a white spirit (turpentine) or an old cloth by rubbing it over the strands – warning: don’t be too aggressive as you can risk scratching or damaging the tile or wall surfaces.

Preparing the bath

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