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

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. See here for advice on how to remove your old bath sealant.

Step one:

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.

Step two:

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 use of the bath or shower bath until the sealant is dry and leave the bath filled with water.

Step three:

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 to applying the sealant.

Step four:

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 calking gun – apply silicon to both the base and the wall if possible.

Step five:

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 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.

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

Step six:

Some bathtubs might not be as close to the wall and as such will need adjustment. Sealing the larger gaps between a bathtub and 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 required, then peel off the backing and press the strip into place where the gap is needed 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’) then lifting and scraping it away with a flat-headed screwdriver.

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.

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