Greater London · England
Remedial Sealant in Shortlands
Specialist remedial sealant for Shortlands: careful preparation, the right product and tidy work. Call for a quick quote.
- Wide, uneven beads that look worse than the old ones
- Mould trapped under a layer of silicone
- Products that weren’t meant for the joint
Remedial sealant in Shortlands
The wrong product in the wrong joint won’t last, however tidy it looks. We take it out and use a sealant made for that joint. We work on botched or over-sealed joints, mouldy bath & shower sealant and expansion joints, and common reasons people get in touch are leaks that keep coming back after resealing and sealant peeling off a dusty or damp surface.
London homes include a lot of flats, conversions and mansion blocks, so a bathroom is often directly above a neighbour’s ceiling. In Shortlands, that is a good reason to put tired sealant and grout right early.
You get a one-year guarantee, the same in Shortlands as everywhere else we work.
- Where
- Shortlands (BR2, BR1, BR3)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Shortlands: your questions answered
Do you take on hotel work around Shortlands?
Yes, hotels and guest houses are among the places we work. A room-by-room programme keeps most rooms in use while the work goes on.
Can worn sealant in a flat in Shortlands cause a leak downstairs?
Yes, it can. Water that gets past failed sealant or cracked grout can run under the bath or tray and show up on the ceiling below. Replacing the sealant and grout before that happens is much less trouble than repairing a neighbour’s ceiling.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Where is Mr Mastic based?
We’re based in Crawley, and we work across South East England, London and Scotland.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we are using and why.
Do you fix expansion and movement joints?
Yes. Where mortar or filler has been used instead of sealant, it’s removed where it can be, and reseal with a flexible product.
Can I choose the sealant colour?
Most of the time, yes. We’ll tell you which colours the right product comes in and agree one before work begins.
Nearby places to Shortlands
More services for Shortlands
Remedial sealant in Shortlands: local notes
There are hotels and other places to stay in and around Shortlands. Hotel bathrooms are part of our work as well as homes, and can be done room by room. 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.
If you live in an older home near St Mark's Church, bathrooms in older houses have often been refitted more than once, with sealant laid over sealant. If you look after a building such as Highfield Infants' School, its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
Shortlands is about 1 mile south-west of Bromley, in Greater London. Whether you’re in the middle of Shortlands or further out, we cover remedial sealant for every kind of property. We cover 764 towns and villages across Greater London, large and small. You can also see our page for London, roughly 8 miles from Shortlands.
Here we cover the BR2, BR1 and BR3 postcode area for remedial sealant. Whether your property is on Hayes Lane, Stone Road and Hayes Road or anywhere close by, we can help. Neighbouring places we cover for remedial sealant include Eden Park (1 mile south-west), Hayes (2 miles south), Bromley Common (2 miles south-east), West Wickham (2 miles south-west) and Southborough (2 miles east). Larger places within reach include London (8 miles north-west), City of Westminster (10 miles north-west), Marylebone (11 miles north-west), Kensington (11 miles north-west), St Pancras (10 miles north-west) and Shoreditch (10 miles north).
Landmarks near Shortlands
In Shortlands, that means homes and buildings near The Richmal Crompton pub, Church House Gardens and Langley Park School for Girls and the streets around them. For rail, the closest station is Shortlands station, roughly 0.5 miles north. Well-known places in the area include Bromley Hospital (0.7 miles east) and Bethlem Museum of the Mind (1.6 miles south-east). The countryside around Shortlands includes Summer Hill and Downham Woodland Walk.
Why act early in Shortlands
Stripping out botched sealant adds time to a reseal, but not by much: it takes a few hours, depending on how many layers have to come out. Compared with chasing the same leak every few months, it’s time well spent. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why choose Mr Mastic in Shortlands
- Arbo and Everbuild products
- You choose the colour before work begins
- 4.9 on Google from 180+ five-star reviews
- ARBOMaster approved applicator
Read our cost guide and what customers say.
How to look after the new joints
Aftercare is simple:
- Keep bleach and abrasives off the bead
- Act on a lifting corner straight away
- Never seal over old silicone
- Do not point over movement joints
If the joint ever needs renewing, have it cut out, not sealed over. New silicone does not bond to old, so the old bead should always come out first.
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.
What sealant work can’t fix
A few problems are outside what sealant work can do:
- Old mastic in a building from before 2000 that should be checked for asbestos before it’s disturbed
- Plumbing leaks behind walls or under trays
- Failed tanking or loose tiles behind the sealant
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Shortlands
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Leaking tray & enclosure joints
- Shrunken worktop sealant
- Expansion joints
- Failed movement joints
How the visit works
We keep the work tidy and contained to the joints we are treating. Expect the work to take a few hours, depending on how many layers have to come out, and we explain the cure time before we leave. In Shortlands, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We protect the surfaces around the joint.
- Every layer of failed sealant is stripped out.
- The joint is degreased and checked for movement and leaks.
- New sealant goes in once the joint is dry, and is tooled smooth.
- We give you the cure time and explain what caused the failure.
Before we arrive
- Clear items away from the joints we’re working on
- Mention if the joints have been sealed before
- Mention any leaks or damp you’ve noticed
Getting a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Advice
Different surfaces, different methods
Over-sealed & botched joints
Previous removal attempts can leave scratches or gouges. We work carefully to avoid adding to it, and point out any existing damage.
Windows & doors
Wrong-coloured or messy mastic can be replaced for appearance too, matched to the frame colour.
Should I try it myself first?
If you’ve already had a go yourself, that is fine. We cut it out and start again, so tell us about it when you ask for a quote.
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.
Common problems we fix in Shortlands
Using the wrong product is a common cause: acrylic caulk in a wet area, a general-purpose sealant on a moving joint, or an acetoxy silicone on natural stone or some metals. None of them last.
Look out for these signs:
- Wide, uneven beads that look worse than the old ones
- Sealant peeling off a dusty or damp surface
- A shower that leaks however often it’s resealed
- Torn expansion joints
If you let a flat or house near Shortlands station, a joint that keeps failing is best fixed properly while the property is empty.
Questions to ask before you book
- What happens if the job turns out different
- What insurance they hold
- What preparation is included
- Is VAT in the price?