What Is Efflorescence & How To Prevent It
What Is Efflorescence & How To Prevent It
August 22, 2018
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How To Seal A Leaking Shower

How To Seal A Leaking Shower

Sealing your leaking shower floor is a very simple task that can be completed DIY using materials available at your local hardware store. This process is as simple as painting a liquid onto the tiles and grout with a paint brush. No tiles need to be removed, and any cracks in the surface (if there are any) can be filled with grout. If that sounds easy, then follow this DIY guide and your leaking shower tile problems will be solved.

Materials required

Shower Plug penetrating sealer

  • Shower Plug 220ml will cover one shower of 7m².
  • Shower Plug 1L will cover up to 30m².
  • 5L and 20L containers are available as well.
Shower plug 220ml
Shower plug 1 Liter

– Brush

Use a natural bristle brush only, because plastic/artificial bristles will leech colour.

– Cloth

Any absorbent rag will do.

– Detergent

Detergent, bleach or vinegar and necessary equipment to clean the surfaces.

bristle brush

– Optional materials (if your grout needs repair):

  • A grout saw, multi-tool with attachment, Stanley knife or other metal tool to scrape grout out
  • Regular superfine grout or sand cement grout with application tools
  • Silicone joint sealant.



Preparation to Repair a Leaking Shower Floor Tile

Sealing grout

If the grout has holes or cracks greater than a hairline in width, you will need to repair them. This is included in the guide below. If the grout is in good condition, you can skip this section.

Repairing damaged grout:

Patch any holes or cracks in the grout with regular superfine or sand cement grout by following the instructions on the package.


If the grout is extensively damaged – if it is sunken in, loose, cracked, crumbling, full of holes, brittle or hollow like in the images below – remove it. There are many power tools that can be used here, but you can do this job by using a grout rake or suitable metal tool. When the grout is removed, vacuum or sweep up the dust and then apply new grout.

Let the grout dry fully. This will take at least four hours.

Pro tip

You can speed up the drying process by using a fan (but don’t use a heater).

Surface Grout
The grout in this wall can be described as ‘surface grout’; hollow, brittle, crumbly old grout with holes in it. Scraping this worn grout out reveals how thin it is.
Grout Joint


Use bleach, detergent or vinegar to scrub away any grime, mould, dirt, etc. and then allow the surface to dry. The surface needs to be totally clear and dry for the liquid Shower Plug to be painted on.


Application of Shower Plug to Fix a Leaking Shower Floor

The tiles and grout need to be rendered waterproof if the leak is to be fixed. For this, we will apply Shower Plug sealant. You can start by pouring it into a tray or bucket.*

  1. Brush Shower Plug onto the tiles with a natural-bristle brush. Wait 5 minutes.
  2. Apply a second coat to the same areas. Wait 5 minutes.
  3. Wipe any excess Shower Plug off with a clean cloth.
  4. Allow the Shower Plug to cure for 12 hours before using the shower again.

*We recommend testing Shower Plug on an inconspicuous area prior to application to ensure satisfaction.

Pro tips
  • Complete the wall area application first, then do the floor to minimise walking on the wet surface.
  • Use quality masking tape to protect the silicone strips, shower glass and metallic fittings from Shower Plug. If any of the Shower Plug splashes onto the glass or metal surfaces, remove it with mineral turpentine (you can also use turpentine to clean your brush). If Shower Plug comes into contact with the silicone joint strips, simply let it dry.

Post-application of sealing your shower

We recommend applying a silicone strip to the joint where the wall and floor meet. This is to safeguard against any cracks developing due to structural movement in the future. Follow the instructions on the package. At the end of the full treatment including silicone application, the joint should look like this:


That’s it. Once the Shower Plug has cured, the shower is now fully water-repellent, protected from mould growth, easier to clean and will remain that way for a minimum of 10 years.



Seal your tiles with Shower Plug

Designed, produced and tested in Australia to the highest standards, Shower Plug is the original sealant for your leaking shower tile and lasts at least 10 years. It will form an invisible, water-repellent barrier that protects any tiled or masonry surface.

To waterproof a single 7m² bathroom or balcony, find the Shower Plug 220mL can here, or for larger areas, the 1L. These products are on the shelf in the Flooring section of your local Bunnings store. Or order online now, and have it delivered within Australia or internationally.

Shower plug 220ml
Shower plug 1 Liter
Concrete Protection Company
Concrete Protection Company
Concrete Protection Company (CPC) is an Australian-owned and operated company which specialises in high-quality solutions in masonry protection. Our objective is to offer high-quality, reliable, long-lasting and easy to use products to help maintain your masonry surfaces.

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