Greater London · England
Blackfriars Remedial Sealant
Removing failed, mouldy or leaking sealant and putting it right for Blackfriars, backed by a 12-month guarantee. Ask us for a quote.
- Kitchen joints letting water behind the worktop
- Smears and lumps from a botched reseal
- Mould trapped under a layer of silicone
Remedial sealant for homes and businesses in Blackfriars
Water on the floor doesn’t always mean failed silicone. A cracked tray, a failed shower valve or a leaking waste can look just the same. When the fault is elsewhere, we say so instead of resealing for the sake of it. If you have wide, uneven beads that look worse than the old ones and worktop sealant that has shrunk and split, we can put it right, on leaking tray & enclosure joints, mouldy bath & shower sealant and shrunken worktop sealant alike.
Hard London water leaves limescale on sealant, grout and taps alike. For a bathroom or kitchen in Blackfriars, getting the joints right keeps water where it belongs and the room looking clean.
You’re covered for a year from the day we finish. If anything isn’t right with it, ring 0345 464 0079 or email us.
- Place
- Blackfriars (SE1, EC1M, EC1N)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
We keep the work tidy and contained to the area we’re working on, so you can carry on as normal. Expect the work to take a few hours for most joints, depending on how much old sealant has to come out, and we explain the cure time before we leave. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- Surrounding tiles, trays and frames are protected first.
- The botched or failed sealant is cut away completely.
- We clean and degrease the joint and look for signs of movement or water.
- Once dry, a suitable sealant is applied and tooled.
- You get the cure time and our view on why the joint failed.
Preparing for the visit
- Mention any leaks or damp you’ve noticed
- Tell us about any previous sealing or DIY attempts
- Clear items away from the joints we’re working on
Get a quote
Need a quote? Please ring 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and give you a clear quote before any work starts.
Read more
Do you need remedial sealant in Blackfriars?
How a joint is built matters as much as the product. A bead bonded on three sides, or laid too thick, can’t flex, so it tears when the joint moves. Backing sets the depth and stops that.
Signs it’s time to call us include:
- Kitchen joints letting water behind the worktop
- Decorators’ caulk around a bath or shower
- Sealant peeling off a dusty or damp surface
- Over-sealed joints coming away
If you look after a building such as Mercers' 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.
Comparing quotes
- Whether they’re fully insured
- How long to leave it before use
- What happens if the job turns out different
- Whether you can choose the colour
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Ask why a joint failed before redoing it
- Report a tray that rocks or a worktop that lifts
- Run the fan after every shower
- Clean sealant with mild products only
Give the new sealant its full cure time: usually around 24 hours, or as long as we advise.
Leaks through failed sealant grow over time. Every shower or downpour sends more water through, into whatever is behind or below. Sorting it early limits the damage.
Honest limits
Before booking, it’s worth knowing the limits:
- A leaking trap, valve or supply pipe
- A cracked shower tray or bath (that needs repair or replacing)
- Failed tanking or loose tiles behind the sealant
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
Joints and surfaces we work on
- Mouldy bath & shower sealant
- Failed movement joints
- Shrunken worktop sealant
- Leaking tray & enclosure joints
- Botched or over-sealed joints
- Expansion joints
What the job involves on each surface
Worktops & kitchens
Old kitchen sealant pulls back from the wall over time. We strip it, degrease the joint and reseal.
Windows & doors
Failed frame mastic is often hard, cracked and in several layers. We remove it all and clean back to sound surfaces before backing and resealing.
Quotes for remedial sealant in Blackfriars
Your quote is based on your job. We look at:
- Whether there’s mould to deal with
- Any working-time requirements on site
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Before you ask for a quote, have a think about:
- The rough size of the job
- How we’d reach the joints
- The address or postcode of the job
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.
Why act early in Blackfriars
Leaks that are left keep doing damage out of sight: soaked floorboards, ceiling stains below and blown plaster. By comparison, sorting the joint is quick. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Blackfriars, the repair is bigger than a sealant job.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why choose Mr Mastic in Blackfriars
- Approved under the ARBOMaster scheme
- We leave the area clean and tidy
- Anti-fungal silicone where joints get wet
- You choose the colour before work begins
Read our cost guide or customer reviews.
Nearby places to Blackfriars
Other services in Blackfriars
Remedial sealant in Blackfriars: local notes
Blackfriars has hotels and guest accommodation nearby. As well as homes, we work in hotel bathrooms, where resealing and regrouting can be done room by room. London’s water is hard, which leaves limescale on sealant, grout and taps, and it has to be cleaned off before new sealant goes in.
Blackfriars is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. For landlords with property near London Blackfriars station, botched sealant from a previous quick fix is easier to strip out between tenants.
Blackfriars is about 1 mile north-west of London, in Greater London. Our applicators cover remedial sealant for homeowners, landlords and businesses in Blackfriars, as part of our work across Greater London. Blackfriars is one of 764 places in Greater London where we work for remedial sealant.
We cover every part of the SE1, EC1M and EC1N postcode area for remedial sealant and the streets around it. If you need remedial sealant at a property on Oat Lane, Bear Lane and Shoe Lane or anywhere close by, our applicators can take on the job. You’ll find Blackfriars on the A4 and A40, so it’s easy for us to get to. We also cover Temple (1 mile west), Temple Bar (1 mile west), Bankside (1 mile south-east), Smithfield (1 mile north) and Clare Market (1 mile west). Further out, we also cover Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (3 miles south).
Around Blackfriars
Locally, jobs take us to homes and businesses close to Barts Health Archives, St Mary-at-Hill and St Alban's Church of England Primary School, among other places. Also close by are Bernie Spain Gardens (within half a mile south-west), London Nautical School (0.5 miles south-west) and The Black Friar pub (less than half a mile south-east). Blackfriars has its own railway station: London Blackfriars station. Nearby you will also find Montfichet's Tower (under half a mile north-east) and St Brides Crypt Museum (within half a mile north-west). Not far away are Barnsbury Wood and St. James's Park Lake.
Blackfriars: your questions answered
Do you work in hotels near Blackfriars?
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.
Could a tired shower seal in my Blackfriars flat affect the neighbours below?
It can, yes: water that gets past a split bead or cracked grout often runs under the tray and shows on the ceiling below. It’s far simpler to replace tired sealant early than to deal with a neighbour’s ceiling.
Does remedial work come with a guarantee?
Yes. Our one-year guarantee covers the work.
Do you remove the old sealant?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Someone resealed my shower and it’s leaking again. Can you help?
Yes. Repeat leaks generally come from over-sealing, movement or water getting in elsewhere, so we find that first.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings. The product needed can limit the range.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will tell you what we are using.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Blackfriars.