DIY & Repairs guide

Reseal a bath or shower with silicone

Remove tired or mouldy sealant and apply a neat, watertight bead of sanitary silicone around a bath or shower tray that lasts for years.

Estimated time: 2–3 hours plus curing timeUpdated: 28 September 2026

Use this guide when sealant around your bath or shower is black with mould, peeling or cracked, or water is getting behind it. You will need a sealant remover tool or plastic scraper, a sharp blade, sanitary silicone, a sealant gun, masking tape and a smoothing tool.

Step by step

  1. Remove the old sealant

    Cut along the top and bottom edges of the old sealant with a sharp blade, taking care not to scratch the bath or tiles. Pull it away in strips and use a plastic scraper or removal tool for stubborn sections. Remove every trace, as new silicone will not bond well to old.

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