Greater London · England
Woolwich Remedial Sealant
Professional remedial sealant in and around Woolwich, with old sealant always removed completely and a 12-month guarantee.
- Decorators’ caulk around a bath or shower
- A second bead peeling off the first
- Smears and lumps from a botched reseal
Surface by surface
Worktops & kitchens
Kitchen joints hold grease and residue, so we spend extra time cleaning before resealing.
Movement & expansion joints
Some movement joints have been filled with mortar or grout. Where it can be raked out, we replace it with flexible sealant.
Remedial sealant in Woolwich
In Woolwich, as anywhere, remedial jobs tend to look alike: over-sealed joints, hidden mould, repeat leaks and split movement joints. Each is stripped back and done again properly. Common call-outs are for beads that never stuck properly and decorators’ caulk around a bath or shower, across shrunken worktop sealant, failed movement joints and mouldy bath & shower sealant.
London’s water is hard, so limescale builds up along sealant lines, in grout and on fittings. For a bathroom or kitchen in Woolwich, getting the joints right keeps water where it belongs and the room looking clean.
You get a one-year guarantee, the same in Woolwich as everywhere else we work.
- Location
- Woolwich (SE18, E16, SE7)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
After the cure time, these simple habits help:
- Clean sealant with mild products only
- Air the bathroom so the sealant can dry
- Keep movement joints clear of mortar and paint
- Keep an eye on the ceiling below the bathroom
Keep an eye on the joint at first, particularly where the original failure was caused by movement. Should anything change, ring 0345 464 0079 or email us.
Leaks through failed sealant grow over time. Every shower or downpour sends more water through, into whatever is behind or below. Early action keeps it to a sealant job.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Remedial sealant in Woolwich: local notes
London has a lot of flats and conversions, and a failed shower or bath seal in one can show up on the ceiling below, so tired sealant is best dealt with early. London has hard water, which leaves limescale on sealant, grout and taps.
As a London address, Woolwich can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like Mulgrave Primary School? Then we reseal washrooms and kitchens in schools and businesses as well as homes.
Woolwich is about 6 miles south-east of Leyton, in Greater London. Homes, rented property, offices and hotels in Woolwich can book us for remedial sealant, old or new, large or small. The work is guaranteed for a year. Our area takes in 764 places across Greater London, from the larger towns to small villages. You can also see our page for London, about 7 miles away.
Postcode districts we cover here for remedial sealant: SE18, E16 and SE7. Remedial sealant is available to properties on Market Street, Woolwich High Street and Beresford Square Market Place and the roads around them. If you’re just outside Woolwich, we cover Plumstead (1 mile east), Charlton (1 mile west), New Charlton (1 mile west), Shooter's Hill (1 mile south) and Kidbrooke (2 miles south-west). Further out, we also cover London (7 miles west), City of Westminster (9 miles west), Marylebone (9 miles west), Kensington (11 miles west), St Pancras (8 miles west) and Shoreditch (7 miles north-west).
Around Woolwich
We work in homes and buildings around Woolwich Common, Oasis Academy Silvertown and Oasis Academy Silvertown and the streets around them. Woolwich has its own railway station: Woolwich Dockyard station. A little further out are Royal Artillery Museum (0.5 miles north-east) and British Hospital for Mothers and Babies (0.5 miles west). Green spaces nearby include Gilbert's Pit.
Common problems we fix in Woolwich
A lot of failed joints have been sealed over rather than replaced. Silicone does not bond to silicone, so the new layer peels, and damp and mould settle between them.
Signs it’s time to call us include:
- Movement joints that have split or pulled away
- Over-sealed joints coming away
- Thick, messy sealant smeared over tiles
- Black mould underneath the bead
If you let a flat or house near Woolwich Dockyard station, failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak.
Comparing quotes
- What product goes in the joint
- How long to leave it before use
- How the surfaces are prepared before sealing
- What happens if the job turns out different
How the visit works
Once we are on site, 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, depending on how many layers have to come out. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- The failure is looked at first, so we know whether it’s sealant, movement or water from elsewhere.
- Old beads and residue are removed down to clean surfaces.
- We treat any mould and dry the joint thoroughly.
- The right product goes in, with backing where the joint moves.
- We finish neatly and point out anything that needs another trade.
How to prepare
- Let us know about parking restrictions
- Let us know about stairs, lifts or work at height
- For business premises, tell us about site rules or sign-in
How to get a quote
Getting a quote is simple: tell us what needs doing and where. Photos by email help us understand the job, and we will come back to you with a quote.
Related advice
Questions from Woolwich
Is parking a problem for a job in Woolwich?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Do you work for landlords with property near Woolwich Dockyard station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
How long does the work take?
Allow a few hours, depending on how many layers have to come out. We’ll give you a timescale when we quote.
Can you match the sealant colour?
In most cases you can choose. We will explain which colours are available.
Are you insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
Do you remove the old sealant?
Yes, every time. New sealant will not bond properly to old, so the joint is cleaned back first.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we are part of it.
When something else is needed
We will always be straight with you, so here’s what sealant cannot fix:
- Cracks in the fitting rather than the joint
- Old mastic in a building from before 2000 that should be checked for asbestos before it’s disturbed
- A tray or worktop that needs refixing first
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Where we work in Woolwich
- Botched or over-sealed joints
- Failed movement joints
- Shrunken worktop sealant
- Leaking tray & enclosure joints
- Expansion joints
- Mouldy bath & shower sealant
Towns and villages near Woolwich
More services for Woolwich
How we quote for remedial sealant
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Which sealant suits the joint
- Working hours on commercial sites
- Any mould that needs treating
- The number of rooms or windows
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or drop us an email.
Helping us quote
To make quoting easier, please include:
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
- Where the property is
For remedial sealant in Woolwich, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before work begins.