How to waterproof a bathtub

John
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How to waterproof a bathtub

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Project Overview

By waterproofing the frame of your bath you help protect the frame from water damage. We show you how to apply the waterproofing membrane yourself. You’ll also see how to prime the surface and cover all the joints properly with reinforcing tape.
Continue to step-by-step instructions

Step by Step Instructions

1 Prime the surface of the bath frame
2 Apply the waterproofing membrane to the surface
  • Step 1. Prime the surface of the bath frame

    Use a paint brush to put primer onto the whole area you want to waterproof. Use a generous amount on every surface. This helps the primer to penetrate the surface properly and create a good seal. It also makes the surface more adhesive for the waterproof membrane.
  • Step 2. Apply the waterproofing membrane to the surface

    Measure up the edges, corners and internal joints that need to be waterproofed. Then cut lengths of reinforcing tape to cover these areas. Paint a coat of waterproofing where the tape will be installed and then put the tape over the top of the still-wet area. Use your brush to flatten the tape out and push it into the corners. Then paint another coat over the top of the tape to reinforce the joint further. To finish, paint the rest of the surface and allow it to cure for at least 24 hours.

Tools and Materials

Tools

  • Measuring tape
  • Paint brush
  • Scissors

Materials

  • Container
  • Primer
  • Reinforcement tape
  • Waterproofing paint
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Health & Safety

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.
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