Greater London · England
Remedial Sealant in Wandsworth
Remedial sealant across Wandsworth and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Repeat leaks from the same joint
- Torn expansion joints
- Products that weren’t meant for the joint
Remedial sealant in Wandsworth
Removing failed sealant is the hardest part of the job. We cut out every layer, clear the residue and degrease the surfaces, without scratching tiles, trays or frames. New sealant only bonds to a clean, dry joint. We work on mouldy bath & shower sealant, botched or over-sealed joints and failed movement joints, and common reasons people get in touch are sealant applied over old sealant that has lifted and mould trapped under a layer of silicone.
London’s water is hard, so limescale builds up along sealant lines, in grout and on fittings. In Wandsworth, remedial sealant is as much about a room looking cared for as about keeping water out.
All our work comes with our one-year guarantee.
- Place
- Wandsworth (SW18, SW15, SW11)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
For landlords and businesses
Landlords and letting agents in Wandsworth can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Housing providers, facilities teams and property managers book us too in Wandsworth and across Greater London. We can quote a run of properties together.
What sealant work can’t fix
New sealant cannot fix everything, and we’d rather say so up front. Sealant won’t put right:
- A cracked shower tray or bath (that needs repair or replacing)
- Leaks from a shower valve, waste or pipework (a plumber’s job)
- Water damage behind tiles that needs a tiler
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Leaking tray & enclosure joints
- Expansion joints
- Shrunken worktop sealant
- Failed movement joints
Towns and villages near Wandsworth
Other services in Wandsworth
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Keep bleach and abrasives off the bead
- Keep the room well ventilated
- Act on a lifting corner straight away
- Keep an eye on the ceiling below the bathroom
Keep the room ventilated: run the fan during and after showers, or open a window.
Signs to act on: peeling layers, mould showing through the bead, leaks after showering or cracks in a movement joint. Each one is worth getting looked at.
Why deal with it now?
Stripping out botched sealant adds time to a reseal, but rarely a lot: it takes a few hours, depending on how many layers have to come out. It’s far less disruption than resealing the same joint again and again. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Wandsworth, the repair is bigger than a sealant job.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Why choose Mr Mastic in Wandsworth
- Domestic, commercial and hotel work
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at our cost guide and customer reviews.
Questions from Wandsworth
I let a flat near Wandsworth Town station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in Wandsworth?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
When is the sealant fully cured?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Quotes for remedial sealant in Wandsworth
We do not publish a price list, because no two jobs are the same. What we look at:
- Mould in or behind the old joints
- Access and height
- The size of the job
- Working hours on commercial sites
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What to tell us for a quote
There’s no need for technical detail. It helps if you can tell us:
- How many joints, rooms or windows are involved
- If someone has resealed it before
- What’s wrong with the joints now
- How we’d reach the joints
Want a quote for remedial sealant? Please call 0345 464 0079 or send us an email with a few details. We will explain what we’d do and send you a clear quote before we start.
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
How the visit works
When we get to you, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours for most joints, depending on how much old sealant has to come out. For a job in Wandsworth, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First we work out whether the problem is the sealant, movement or a leak.
- Each layer is cut out and the residue cleaned off.
- Mould is treated and the joint dried.
- We reseal with a product suited to the joint, backed where needed.
- The joint is tooled and you’re told about anything else we found.
Preparing for the visit
- Let us know about earlier repairs to the joints
- Let us know about stairs, lifts or work at height
- Let us know about parking restrictions
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
Advice
Wandsworth homes and their sealant
In a London flat, water from a failed bath or shower seal can reach the neighbours below, so tired sealant is best dealt with early. London’s water is hard, so limescale builds up on sealant, grout and fittings, and it has to be cleaned off before new sealant goes in.
For site and facilities teams at buildings such as St Anne's CofE Primary School, washroom and kitchen sealant there needs the same care as at home, and schools and businesses are part of our work as well as homes. Rented homes near Wandsworth Town station change hands often, and botched sealant from a previous quick fix is easier to strip out between tenants. Wandsworth is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Wandsworth is about 3 miles south-west of Brompton, in Greater London. Anywhere in SW18, we cover remedial sealant for homes and businesses. Our Greater London coverage runs to 764 places, Wandsworth among them.
All of SW18, SW15 and SW11 is within our area for remedial sealant, from the main roads to the quietest streets. Streets in the area include Alma Road, Marl Road and Knoll Road, and we cover them all. Neighbouring places we cover for remedial sealant include Southfields (1 mile south), Earlsfield (1 mile south), Hurlingham (1 mile north), Clapham Junction (1 mile north-east) and Battersea (1 mile north-east). We also work in nearby towns such as London (5 miles north-east), City of Westminster (4 miles north), Marylebone (5 miles north-east), Kensington (3 miles north), St Pancras (6 miles north-east) and Shoreditch (7 miles north-east).
Around Wandsworth
We work in homes and buildings around Ashcroft Technology Academy, Emanuel School and Spread Eagle pub. There’s a railway station in Wandsworth itself: Wandsworth Town station. Well-known places in the area include Southside Wandsworth (within half a mile west) and Antique Breadboard Museum (1.4 miles north-west). For a walk, there’s Battersea Park Lake and Henman Hill.