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How to seal a shower tray

Follow our guide to effectively use silicone sealant to seal your shower tray

Thursday 31st December 2020

After time, the silicone sealant around 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 shower tray, which can lead to leaks or water getting under your tiles and causing them to lift.

It’s all too easy to look on resealing your shower tray as a daunting task, but removing old sealant and then sealing the shower tray again is easier than it might seem. Follow our step-by-step instructions below and your shower tray seals will once again be watertight and free from blemishes. 

Removing old silicone sealant 

If you are resealing your shower tray, you’ll first need to remove the old sealant. It’s important to thoroughly remove all of the old sealant before you apply new product, as failure to do so could mean a leaky shower tray.

You will need 

  • Sealant remover 
  • Mould remover 
  • Sealant removal tool, a chisel or a Stanley knife 
  • Thick safety gloves 

How to remove old sealant from your shower tray 

Step 1 

Apply sealant remover to the existing sealant, following the specific product instructions. This will help to break down the existing sealant and make it easier to remove. 

Step 2 

Use a sealant remover tool, a chisel or a Stanley knife to gently remove the existing sealant. If you have a sealant remover tool, you’ll see it has a pointed tip designed to pierce the sealant and scrape it away. 

Step 3 

Use your finger or thumb to rub off any small remaining strands. If you prefer, you can use white spirit and an old cloth to rub the remaining strands until they come off. 

Step 4 

If the sealant had become mouldy, clean the surface with mould remover, leaving the product on for as long as required based on the product instructions. 

Step 5 

Rinse off the mould remover, and you're ready to reseal your shower tray. 


How to seal a shower tray 

You will need  

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

A step-by-step guide to sealing a shower tray 


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

Also make sure that your shower tray is clean and completely dry. If there’s any moisture on the shower tray, the shower sealant may not fully adhere to the surface. 

Step 1 

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

Step 2 

Using the narrowest point of the nozzle on the sealant, go around the edges of the 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 3 

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 shower tray. 

Step 4 

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 5 

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

Step 6 

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

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. 

Mira shower trays 

If you’re looking for a new shower tray, we have a wide range of shapes and styles to suit your space. From square and rectangle shower screens to walk-in options, all our Mira Flight shower trays are built to last. They’re made from durable materials that make them scratch and chip resistant, and they feature BioCote® technology to reduce bacteria and mould growth by up to 99.9% and keep your shower tray looking as good as new for as long as possible. 

They’re designed with safety in mind too, with anti-slip technology to make showering safer for all the family. 

Explore our full range of shower trays or, if you’re a professional installer, check out our shower tray FAQ page.