How to seal a shower tray


Whether you fitting a new shower tray or resealing your existing tray, our guide on how to seal a shower tray will take you through the job step-by-step.  

Once you get the preparations out of the way, sealing a shower tray or bathtub is a fairly simple task that any DIYer can do. Our guide will make sure you have the right tools, products and techniques for a quick and easy job.

How to seal a shower tray

Preparing your shower tray

Before you get started, you may need to remove old or damaged sealant from your shower tray. If this is the case, you’ll need to use a utility knife or chisel to cut away as much sealant as possible. You should do so with appropriate safety gloves and be careful not to damage the tray or tiles. Peel away any strands and rub the remaining sealant with white spirit on a cloth.

Once you’ve removed any old sealant, make sure to clean your shower tray and tiles with a cloth soaked in warm water and a mild cleansing agent. Rinse the area with a clean, damp cloth and dry thoroughly. You may want to leave the shower to air dry completely, as moisture will prevent the sealant from properly bonding with the surface.

What you’ll need

How to seal a shower tray

  1. Apply a length of masking tape both on the surface above and the tray below, about 3mm from where you’ll apply the sealant. This will make clean-up much quicker and easier, as well as ensuring you get a neat and tidy line.
  2. Particularly if you’ve had problems with the seal in the past, it’s a good idea to apply two layers of sealant to the shower tray. Fit the sealant tube into the skeleton gun and cut off the very tip of the tube. You want this first opening to be small enough to really fit into the gap.
  3. Apply an even bead of sealant into the gap, starting from the innermost corner, and move outwards in a steady motion. Then, use a wet finger to smooth the sealant and press it firmly into the gap.
  4. Continue immediately with the second layer by cutting the nozzle with your utility knife, about 2cm from the tip at a 45-degree angle. This will help to create a smooth line and flatten the sealant as you apply.
  5. Apply the second layer as before and, again, run a wet finger gently along the sealant to ensure the gap is filled.
  6. Remove the masking tape while the sealant is still wet and leave to dry for at least 24 hours.

And that’s it! Your shower tray or bathtub is now ready for use. Take a look at our range of showers and plumbing tools to finish the job.