How To Seal A Bath

Creating a watertight and hygienic bathroom should be of the utmost importance for any homeowner, achieving this relies heavily on properly sealing, particularly the bath. Among the various methods available, using silicone sealant stands out as a highly effective option for sealing a bath or other bathroom furniture susceptible to being exposed to water.

That’s why we’ve create this article to help you understand how to seal a bath.

Why should I seal a bath?

First things first, why is sealing your bath important? Sealing a bath is essential to protect the integrity of the bathroom’s physical structure. By keeping water from seeping through the walls and floor, it prevents any possible water damage that may occur due to rotting wood or damp plasterboard and electrical wires behind them.

In addition to a properly sealed bath, you prevent the growth of mould and mildew by blocking any moisture from getting behind the tiles or under the flooring. This affords you a more hygienic bathroom which is better for your health.

Requirements for sealing a bathroom:

  • Safety glovesĀ 
  • Masking tapeĀ 
  • Silicone applicator or a round-headed tool
  • Caulking gun
  • Stanley knife
  • Silicone sealant

How to Seal A Bath With Sealants

Step 1: Prepare the surface

Clean and dry the bathtub and the surrounding area completely. Using a Stanley knife, remove any existing sealant carefully so that neither the bath nor the tiles get damaged. You’ll then clean the surface with detergent or solvent and allow it to dry.

Step 2: Mask off the area

Apply masking tape along the edges of the bath and any adjacent surfaces where you don’t want the sealant to spread. This step will create clean lines and simplify the cleanup process.

Step 3: Load the caulk gun:

Position the silicone sealant tube into the caulk gun and make a 45-degree cut in the nozzle’s end. Ensure the opening is small enough to provide precise control over the flow of the sealant.

Step 4: Apply the sealant:

Starting from one corner, slowly and steadily squeeze the trigger of the caulk gun to apply a thin, even line of sealant along the joint between the bath and the adjacent surface. Move along the joint with a consistent motion, ensuring complete coverage.

Step 5: Smooth the sealant:

Using a silicone applicator or a round-headed tool, smooth the sealant immediately after application. Apply gentle pressure to spread and shape the sealant, creating a neat finish, removing any excess sealant with a damp cloth.

Step 6: Remove masking tape:

Prior to the sealant drying, cautiously peel away the masking tape at a 45-degree angle. This step will prevent the sealant from tearing or pulling away when the tape is removed.

Step 7: Allow the sealant to cure:

It is necessary to adhere to the manufacturer’s curing instructions for the silicone sealant. The duration of curing will be dependent upon each sealant.


In a nutshell, it is crucial to create a watertight and sanitary atmosphere in your bathroom by sealing it with materials like silicone sealant. With this guide, you can guarantee a professional and efficient seal for your bathtub.

Additionally, it’s important to use high-quality materials, equipment. If you’re unsure of doing this yourself you can consider soliciting the assistance of a professional.

Google’ing mastic man in London, or switching locations to your city, will pull up a list of professionals you can call upon to help. A skilled mastic man has the expertise and experience to handle the sealing process efficiently, ensuring a long-lasting and reliable seal. They can provide valuable guidance, use high-quality materials, and offer a precision application for a neat and professional finish.