Greater London · England
Remedial Sealant in Catford
Failed sealant joints in Catford need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Gaps opening along the back of the worktop
- Dark patches showing through the sealant
- Decorators’ caulk around a bath or shower
When to call us in Catford
Water from somewhere else can ruin a good seal. A slow leak behind the tiles soaks the joint from the back, so the silicone goes mouldy or lets go.
Most people get in touch when they notice one of these:
- Movement joints that have split or pulled away
- Worktop sealant that has shrunk and split
- Caulk or the wrong sealant used in a wet area
- Over-sealed joints coming away
Catford is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Before you book anyone
- Whether the sealant suits the joint
- How much experience the applicator has
- When the joint can take water or movement
- Which colour the sealant will be
How we handle remedial sealant in Catford
Water on the floor doesn’t always mean failed silicone. Cracked trays, leaking wastes and faulty valves often look like a sealant problem. When the fault is elsewhere, we say so instead of resealing for the sake of it. We work on failed movement joints, expansion joints and mouldy bath & shower sealant, and people most often call us about sealant that came away because the surface wasn’t prepared and decorators’ caulk around a bath or shower.
In much of London, period terraces have been converted into flats over the years, with bathrooms fitted into whatever space was available. Small, steamy rooms are where mould gets into sealant and grout fastest.
There’s a 12-month guarantee on every job, large or small.
- Location
- Catford (SE6, BR1)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why it’s worth doing now in Catford
Ripping out a bathroom is not generally needed. When the fittings are sound, stripping and resealing the joints is often enough. Where something else has failed, you’ll hear it from us. In a flat in Catford, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why choose Mr Mastic in Catford
- Trusted Arbo and Everbuild sealants
- Neat joints and a tidy finish
- You choose the colour before work begins
- A choice of colours where the product allows
Take a look at our cost guide or customer reviews.
Landlords, agents and businesses in Catford
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
How it works
On the day, we look over the joints with you first, so there are no surprises. Surfaces next to the work are protected before work begins. The work normally takes a few hours for a typical bath or shower, longer where several layers have been applied. In Catford, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at how the sealant has failed and check for movement or a leak path.
- We strip the joint completely, removing any layers below.
- Next, any mould is treated and the joint dried.
- We use the right backing and sealant for any joint that moves.
- The new joint is tooled neatly and we explain anything else we found.
Before we arrive
- Let us know about stairs, lifts or work at height
- Clear the area around the work
- Keep children and pets away from the work area
How to get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, phone 0345 464 0079 or send us an email.
Advice
Remedial sealant around Catford
London has hard water, which leaves limescale on sealant, grout and taps. 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.
If you look after a building such as Holy Cross Catholic Primary School, its toilets, changing areas and kitchens need their sealant renewed like any other building’s. Homes close to Church of St Laurence and Community Centre include some older properties, and older homes can move a little, which is hard on rigid grout and tired sealant.
Catford is about 5 miles east of Streatham, in Greater London. Jobs in Catford get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Catford is one of 764 places in Greater London we cover.
Postcode districts we cover here for remedial sealant: SE6 and BR1. We cover properties on Bargery Road, Penerley Road and Inchmery Road. Nearby, we also carry out remedial sealant in Bellingham (1 mile south-west), Southend (1 mile south-west), Ladywell (1 mile north), Hither Green (1 mile north-east) and Bell Green (1 mile south-west). Larger places within reach include London (5 miles north-west), City of Westminster (8 miles north-west), Marylebone (8 miles north-west), Kensington (9 miles north-west), St Pancras (7 miles north-west) and Shoreditch (6 miles north-west).
Landmarks near Catford
In Catford, that means homes and buildings near The London & Rye pub, Trinity Church of England School and Forster Memorial Park. Catford’s nearest station is Catford Bridge station, about 0.5 miles north-west of the centre. A little further out are Greenwich Castle (2.6 miles north) and University Hospital Lewisham (0.8 miles north). The countryside around Catford includes Downham Woodland Walk and Knight's Hill.
Places near Catford
Other services in Catford
Aftercare tips
Looking after new joints is easy:
- Do not add new sealant on top of old
- Keep movement joints clear of mortar and paint
- Keep the room well ventilated
- Check ceilings under showers for marks
Give the new sealant its full cure time: generally around 24 hours, or as long as we advise.
Mould trapped under over-sealed joints spreads unseen. When it finally shows, the whole bead needs to come out.
Different surfaces, different methods
Over-sealed & botched joints
Botched joints sometimes have damaged edges from earlier scraping. We work carefully to avoid adding to it, and tell you about any damage we find.
Movement & expansion joints
Movement joints in floors, walls and façades need a flexible sealant set to the right depth. Failed sealant is cut out, backing rod or tape is fitted and the joint resealed.
DIY versus a professional finish
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Questions from Catford
Can parking be tricky for a visit in Catford?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
I live in a flat in Catford. Can a failed seal leak into the flat below?
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. It’s far simpler to replace tired sealant early than to deal with a neighbour’s ceiling.
How long does the work take?
Longer than a simple reseal, because every layer has to come out. Most jobs take a few hours.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Someone sealed over the old bead. Can you fix it?
Yes. Stripping layered sealant takes longer than a normal reseal, but it’s the only way the new joint will last.
Are you fully insured?
Yes, we’re fully insured.
I’m a tenant. Can you help?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses.