Kent · England
Underriver Remedial Sealant
Remedial sealant in Underriver from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Repeat leaks from the same joint
- Floor or wall movement joints that have failed
- Black mould underneath the bead
What we can’t put right
We will not take on work that won’t last, so here’s what sealant cannot put right:
- A leaking trap, valve or supply pipe
- Tiles that have come away from the wall
- A cracked shower tray or bath (that needs repair or replacing)
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Leaking tray & enclosure joints
- Failed movement joints
- Expansion joints
- Botched or over-sealed joints
- Mouldy bath & shower sealant
- Shrunken worktop sealant
How we handle remedial sealant in Underriver
The wrong product in the wrong joint fails however neatly it’s applied. Out it comes, and in goes a sealant suited to the job. If you’re dealing with mould trapped under a layer of silicone and sealant peeling off a dusty or damp surface, we can help, whatever the surface.
In a village or hamlet like Underriver, homes are often older cottages and farmhouses alongside a few newer houses. Older walls and timber floors can move a little, and cracked grout and split sealant are often the first signs.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Underriver (TN15)
- Region
- Kent
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Towns and villages near Underriver
More services for Underriver
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Underriver: your questions answered
Will you come out to Underriver?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you work for landlords with property near Hildenborough station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Do you offer different sealant colours?
Normally, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
How long before the joint can be used?
Different products cure at different speeds, so follow the cure time we give you when we finish.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
Are you fully insured?
Yes. We’re fully insured for every job we do.
Can you remove old sealant without damaging the bath?
Yes. We cut and lift the old sealant with tools suited to the surface, then clean off the residue. We point out any damage that’s already there.
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Quotes for remedial sealant in Underriver
Every job gets its own quote. These are the things that affect it:
- The type of sealant required
- When we can work, for business premises
- Any mould that needs treating
- Whether the work is at height
The cost depends on the amount of work, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- Pictures of the joints, sent by email
- Where the job is, and your postcode
- Any access issues, like height or stairs
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or send us an email with the details, and pictures are welcome.
Common problems we fix in Underriver
How a joint is built matters as much as the product. A bead bonded on three sides, or laid too thick, cannot flex, so it tears when the joint moves. Backing sets the depth and stops that.
It’s worth asking for a quote if you see:
- Black mould underneath the bead
- Worktop sealant that has shrunk and split
- Thick, messy sealant smeared over tiles
- A shower that leaks however often it’s resealed
Homes close to Church of St Margaret include some older properties, and walls and floors in older homes can move, and sealant and grout show it first.
What to look for in a quote
- Which colour the sealant will be
- How much experience the applicator has
- What preparation is included
- How hidden problems are handled
What remedial sealant looks like in Underriver
Hard water is the norm across most of the South East, so limescale builds up on sealant, grout and fittings.
If you let a flat or house near Hildenborough station, failed or mouldy sealant is worth putting right between tenancies, before it turns into a leak. Managing a site like Sevenoaks Preparatory School? Then its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
Underriver is about 3 miles south-east of Sevenoaks, in Kent. We provide remedial sealant to homes and businesses in Underriver and nearby, as part of our work across Kent. Underriver is one of 922 places in Kent where we work. You can also see our page for Crawley, about 20 miles away.
Here we cover the TN15 postcode area for remedial sealant. We also cover Budds (1 mile east), Bitchet Green (1 mile north-east), Watt's Cross (2 miles south), Godden Green (2 miles north) and Stone Street (2 miles north-east). Larger places within reach include Maidstone (13 miles east), Dartford (14 miles north), Sevenoaks (3 miles north-west), Royal Tunbridge Wells (8 miles south), Gravesend (14 miles north-east) and Tonbridge (4 miles south-east).
Near you in Underriver
Typical jobs here are in homes near Knole Park and the streets around them. The nearest railway station is Hildenborough station, roughly 2.3 miles south of the centre. Other landmarks nearby include Sevenoaks Museum (2.2 miles north-west) and Tonbridge Castle (4 miles south-east). Green spaces nearby include Dryhill Nature Reserve and Barden Lake.
What happens if it’s left?
DIY removal often leaves scratches and a film of residue, and any film left behind stops new sealant sticking. Careful removal is most of a remedial job. Where a wall is exposed, as many are in small places like Underriver, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit is normally more efficient than separate visits. You will get one clear quote for the whole job.
Why choose Mr Mastic in Underriver
- We are fully insured
- Domestic, commercial and hotel work
- Tidy, careful work
- ARBOMaster approved applicator
What happens on the day
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours, depending on how many layers have to come out and we leave things clean and tidy. Somewhere like Underriver needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We finish neatly and point out anything that needs another trade.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- For business premises, tell us about site rules or sign-in
- Let us know about stairs, lifts or work at height
How to get a quote
There’s no standard price list. Instead, we give you a clear price for your job. To arrange one, call 0345 464 0079 or email us.