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How To Seal A Bath, Shower Tray, or Sink

Follow our guide to effectively using silicone sealant in your bathroom

Blog
Friday 10th December 2021

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

Resealing your bath, shower tray or sink will not only get your bathroom back to looking as it should, it will also help to prevent leaks and costly damage in the future.

It’s easy to seal a shower tray, bath or sink when you know how, without the need for paying a professional to help out. Follow our step-by-step instructions below to remove sealant from your bath, sink and shower tray and reseal them with silicone so that they are once again watertight and free from blemishes.

What you will need to seal your bath/sink/shower tray: 

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

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. 

A step-by-step guide to resealing your bath, shower tray or sink 

Step 1 

Remove the old sealant using a Stanley knife or a specialist sealant remover. Cut along the top and the bottom of the old sealant, taking care not to scratch your bath, sink or shower tray, pull the sealant out, and scrape away any residue. It’s likely that the area will be a bit greasy and grimy, so use warm, soapy water to give it a good clean, then leave it to dry thoroughly before you start to reseal.  

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, sink, or shower tray. 

Step 7 

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

And that’s it, you’ve successfully resealed your sink, 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 trays 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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