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How to seal a shower or bath

Follow our guide to effectively use silicone sealant in your bathroom

Friday 23rd June 2017

After time, the silicone sealant around baths or shower trays needs replacing. In some cases, it can get unappealing black spots that can ruin the look of your otherwise pristine bathroom. Or, other times, it loses its adhesion and detaches from the surface of the bath or shower, which can lead to leaks or water getting under your tiles and causing them to lift.

It’s all too easy to look on this as a daunting task and just assume that you don’t know how to seal a shower tray or around a bath. But before you call in a costly professional, have a look at our guide and you might find that it’s actually much easier than it seems and a bit of rudimentary DIY that you may be able to do yourself. Follow our step-by-step instructions below and your bath and shower tray seals will once again be watertight and free from blemishes.

Step 1 Preparation

You will need the following:

  • Silicone sealant
  • A sealant gun
  • Stanley knife
  • Masking tape
  • Silicone wipes
  • Kitchen towel or a damp j-cloth


Step 1

Make sure you have silicone sealant and not normal grout. Grout isn’t suitable for sealing around your bathtub or shower tray as it’s not flexible and will crack as soon as any weight is placed on the tub or tray.

Step 2

Stick masking tape above and below where you’re going to seal. Stick the first length of tape along the shower tray or bathtub about 3mm away from the wall. Stick the second length of tape along the wall about 3mm above the bathtub. This should leave you with a gap between the two pieces of tape. This is where the sealant will go.

Step 3

Using the narrowest point of the nozzle on the sealant, go around the edges of the tub or tray applying a narrow layer of sealant. Run your finger along to press the sealant right into the cracks, ensuring it’s completely covered and airtight and that there are absolutely no gaps.

Step 4

Using a Stanley knife, cut the nozzle of the silicone sealant about 2cm down the nozzle at a 45-degree angle. This should result in a wider layer of sealant that will fill the gap between the two lengths of tape. Then go over the areas you’ve already sealed to apply a second layer of sealant the whole way around the tub or shower tray.

Step 5

Wet your finger with a silicone wipe and run it along the layer of sealant to make sure the line is perfectly smooth without any lumps or gaps.

Step 6

Before the sealant dries, remove the masking tape from the wall and the bathtub/shower tray.

Step 7

Go around the bath or shower tray and clean off any sealant that might have spilled before it dries.

And that’s it, you’ve successfully sealed your shower tray or bathtub! This process can easily be adapted if you need to seal other items in your bathroom, such as shower enclosures or shower screens that need to be watertight.

If you need further help and support, please always refer to our Installation and User Guides for your particular product to ensure you get the very best experience out of all Mira products



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