---
title: "Sealant Repair (Sanitary) | Northstar Plumbing"
description: "Renew and replace sanitary silicone around baths, showers and basins to stop water ingress, reduce mould and protect walls and floors."
canonical: "https://www.northstarplumbing.co.uk/services/sealant-repair-sanitary"
---

![3D render of renovation prep tools and materials on a clean surface in an unfinished interior corner with bare studs and exposed pipe ends, cool professional lighting and ample negative space.](/_next/image?url=%2Fapi%2Fmedia%2Ffile%2Frenovation_planning_craftsmanship_3d_render.png%3Fv%3D1770397989263&w=1536&q=75&dpl=dpl_DEc4fGhEc1SCRZZutzoEsRuDy1CJ)

General Plumbing Repairs

# Sealant Repair (Sanitary)

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Sanitary sealant repair restores the waterproof silicone bead around baths, showers and basins. Replacing split, loose or mouldy sealant helps prevent water ingress that can lead to damp, staining and damage behind tiles or units, while leaving a clean, neat finish.

## What sanitary sealant repair covers

Sanitary sealant repair focuses on renewing the silicone bead where water regularly sits or splashes, so the area seals properly again.

-   Removal of failed or contaminated silicone
-   Careful preparation of edges for good adhesion
-   Application of sanitary-grade silicone for a smooth, watertight bead
-   Resealing around baths, shower trays, enclosure frames and basins
-   Visual checks to confirm coverage and a tidy finish

### When this service is the right fit

This service is most useful when you want a reliable seal, without guesswork, and you need the area back in use with minimal disruption.

Common reasons to book include:

-   Cracked, lifting or missing sealant
-   Persistent black mould that returns after cleaning
-   Water escaping onto floors or into gaps at the bath edge
-   Sealant that feels soft, sticky, or has shrunk away
-   Pre-tenancy or changeover refresh for rental bathrooms and washrooms

### What to expect on the day

The area is assessed first to confirm whether the issue is limited to sealant or if there is a wider leak or movement problem.

Typical steps include:

1.  Protecting nearby surfaces and removing the old silicone fully
2.  Cleaning and drying the joint to help the new seal bond properly
3.  Applying fresh sanitary silicone and tooling it for a consistent finish
4.  Final checks and clear advice on curing time before getting the area wet

### Aftercare and ongoing value

Good aftercare helps the new seal last longer.

You will be advised on:

-   How long to leave the sealant to cure before using the bath or shower
-   Simple cleaning habits that reduce mould build-up
-   What warning signs to watch for if movement or an underlying leak returns

[Contact Us](https://www.northstarplumbing.co.uk/redirect)

## Frequently Asked Questions

Do you remove the old silicone before applying new sealant?

Yes, the existing sealant is normally removed fully so the new silicone can bond properly. Sealing over old silicone rarely lasts and can trap moisture and mould.

How long before I can use the shower or bath again?

Cure time depends on the product used and the joint depth, but it is commonly at least 24 hours. You will be told the safe wait time before the area gets wet.

Will resealing stop a leak?

If the water is escaping through a failed sealant joint, resealing will usually resolve it. If the leak is coming from pipework, a waste fitting, or movement in the bath or tray, further repair may be needed.

Why does sanitary sealant fail or go mouldy?

Common causes include poor ventilation, harsh cleaning chemicals, and water sitting on the joint. Movement at the bath edge or shower tray can also split the seal over time.

How can I keep the new sealant in good condition?

Keep the bathroom well ventilated and wipe down wet edges after use where practical. Use non-abrasive cleaners, and avoid picking at the sealant if you notice a small imperfection.

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