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How to waterproof a bathtub

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.

Steps

1Prime 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.

2Apply 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.

Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. 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.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.