Greater London · England
Remedial sealant & repairs in Broad Green, Greater London
Our applicators work in Broad Green on removing failed, mouldy or leaking sealant and putting it right. Old material cut out, joints cleaned and sealed neatly.
- Dark patches showing through the sealant
- Smears and lumps from a botched reseal
- A shower that leaks however often it’s resealed
Remedial sealant for homes and businesses in Broad Green
Movement and expansion joints fail when the sealant can’t stretch. We cut out the failed sealant and set the depth with backing, then a flexible sealant matched to the movement goes in. We are often asked to deal with smears and lumps from a botched reseal and black mould underneath the bead, on mouldy bath & shower sealant, failed movement joints and shrunken worktop sealant.
London homes include a lot of flats, conversions and mansion blocks, and many bathrooms sit right above someone else’s ceiling. In Broad Green, that’s a good reason to put tired sealant and grout right early.
Big or small, it’s backed by our 12-month guarantee in Broad Green and across Greater London.
- Location
- Broad Green (CR0, CR7, CR90)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Act on a lifting corner right away
- Look for stains below bathrooms now and then
- Never seal over old silicone
- Find out why the sealant failed first
Clean gently: a mild cleaner and a soft cloth, with no blades or scourers.
Mould under a second layer of sealant keeps growing out of sight. When it finally shows, the whole bead needs to come out.
What we can’t put right
In fairness, there are a few things sealant will not fix:
- A bath, tray or worktop that moves until it’s properly fixed
- Older mastics that may need an asbestos check before removal
- Cracks in the fitting rather than the joint
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Leaking tray & enclosure joints
- Botched or over-sealed joints
- Expansion joints
- Shrunken worktop sealant
- Mouldy bath & shower sealant
- Failed movement joints
What happens on the day
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a typical bath or shower, longer where several layers have been applied from start to finish. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Broad Green. A visitor permit or a nearby bay makes the visit run more smoothly.
- We start by checking the joint for movement, leaks and the reason it failed.
- All the old sealant comes out, including any layers underneath.
- We clean the joint, treat any mould and let it dry.
- Where the joint moves, backing and a flexible sealant suited to the movement go in.
- Finally we finish the joint and talk you through what we found.
How to prepare
- Let us know if you’ve seen damp or leaks
- Clear the area around the work
- Tell us about any previous sealing or DIY attempts
Getting a quote
If you’re in Broad Green and need remedial sealant, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Towns and villages near Broad Green
What else we do in Broad Green
Broad Green homes and their sealant
In a London flat, water from a failed bath or shower seal can reach the neighbours below, which is why it’s worth fixing early. Broad Green has hotels and guest accommodation nearby. Hotel bathrooms are part of our work as well as homes, and can be done room by room.
Homes close to Church of St Saviour include some older properties, and older homes can move a little, which is hard on rigid grout and tired sealant. Broad Green is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Broad Green is about 6 miles south of Stockwell, in Greater London. From the centre of Broad Green to the outskirts, we cover remedial sealant for every kind of property, from flats and houses to offices and hotels. 764 places in Greater London are on our list, from the larger towns to small villages. London is on our list too, about 8 miles from Broad Green.
We cover every part of the CR0, CR7 and CR90 postcode area for remedial sealant and the streets around it. If you need remedial sealant at a property on York Road, Nova Road and Lion Road or anywhere close by, we can help. We also cover Old Town (1 mile south), Beddington (2 miles south-west), Waddon (2 miles south), Bandonhill (2 miles south-west) and Wallington (2 miles south-west). Within a short drive, we also cover London (8 miles north), City of Westminster (9 miles north), Marylebone (9 miles north), Kensington (9 miles north-west), St Pancras (10 miles north) and Shoreditch (10 miles north).
What’s near Broad Green
Around Broad Green, our work takes us to homes and buildings near Harris Invictus Academy Croydon, The Half Moon pub and Waddon Ponds, among other places. The nearest railway station is West Croydon station, roughly 0.6 miles south of the centre. Well-known places in the area include Centrale Croydon (0.8 miles south) and Croydon University Hospital (less than half a mile north-west). The countryside around Broad Green includes Duppas Hill and Biggin Wood.
How the job changes by surface
Mouldy bath & shower sealant
Mould that has grown into silicone does not clean out for good. The sealant is cut out completely, the joint treated with a mould remover and dried before anti-fungal sanitary silicone goes in.
Worktops & kitchens
Kitchen joints often have grease and cleaning residue deep in them, so cleaning takes longer than in a bathroom before resealing.
Broad Green: your questions answered
Is parking an issue for remedial sealant in Broad Green?
Parking in Broad Green, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for hotels and guest houses in Broad Green?
Yes. Hotel and guest-house work is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you work in Broad Green?
Yes. We cover Broad Green, as part of our work across South East England, London and Scotland. For a quote, ring 0345 464 0079 or email us.
What if the leak is not the sealant?
In that case, we tell you what we’ve found. A plumber or fitter may be needed before any new sealant goes on.
Where is Mr Mastic based?
We are based in Crawley, West Sussex, and we cover South East England, London and all of Scotland.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Common problems we fix in Broad Green
Some joints fail because water is reaching them from behind. A leaking valve, a failed waste or cracked grout feeds water behind the bead, and the sealant lifts or goes mouldy from underneath.
It’s worth asking for a quote if you see:
- Torn expansion joints
- Leaks that keep coming back after resealing
- Decorators’ caulk around a bath or shower
- Worktop sealant that has shrunk and split
Rented homes near West Croydon station change hands often, and a joint that keeps failing is best fixed properly while the property is empty.
What your quote should include
- What guarantee comes with the work
- When the joint can take water or movement
- How the joint is cleaned and prepared
- What happens if they find a problem under the old sealant