Kent · England
Window & door mastic in Thong, Kent
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Thong. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Draughty joints inside around the window
- Rain getting in at the frame or under the sill
- Sealant in the wrong colour for the frame
About our window mastic in Thong
Around Thong we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you’re dealing with draughty joints inside around the window and hard, cracked sealant around windows, we can help, on uPVC windows, patio & French doors and timber windows & doors alike.
Mastic can only go onto a dry, clean joint, so window work in Thong is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Every job is covered by a one-year guarantee, wherever you are in Kent.
- Place
- Thong (DA12)
- Wider area
- Kent
- Cover
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Surface by surface
Window sills
Where a sill meets brick or render, the ends often crack first. A tight seal at each end keeps rain out of the wall.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
For landlords and businesses
We work for landlords and agents as well as householders. Sealant work between tenants keeps a property looking cared for.
We also work for property managers and facilities teams in Thong and across Kent. Several sites can be quoted together.
Quotes for window mastic in Thong
We quote each job individually. This is what makes a difference:
- The old material and how stubborn it is
- How much there is to do
- Which sealant suits the joint
- Any mould that needs treating
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
Helping us quote
To help us quote quickly, please include:
- What’s wrong with the joints now
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
- Where the property is
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Towns and villages near Thong
What else we do in Thong
Thong: your questions answered
Is window mastic in a coastal place like Thong any different?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Can you help a landlord with a rental near Sole Street station?
Yes, we work for landlords and agents. Just call 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We can do either or both.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Can you do upstairs windows?
Yes, in most cases. Access is planned before we start.
How many windows can you do in a day?
A handful of frames is a short visit. You will get a timescale with the quote.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Windows and doors in Thong
Thong is within about 3 miles of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Riverview Infant School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near Church of St Peter and St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Thong is about 2 miles south-east of Gravesend, in Kent. For window mastic in and around Thong, it’s easy to get a quote: please phone 0345 464 0079 or email us. We are based in Crawley and cover Kent, Thong included. Across Kent, we cover 922 places, and Thong is one of them. There’s also a page for London, roughly 22 miles from Thong.
Postcode districts we cover here for window mastic: DA12. Close by, we work in Upper Ifield (1 mile east), Shorne Ridgeway (1 mile east), Shorne (1 mile east), Chalk (1 mile north) and Higham (2 miles east). We also work in nearby towns such as Maidstone (11 miles south-east), Sittingbourne (15 miles east), Dartford (8 miles west), Sevenoaks (13 miles south-west), Northfleet (3 miles north-west) and Swanley (10 miles west).
What’s near Thong
In Thong, that means homes and buildings near Shorne Woods Country Park and Thamesview School and the streets around them. The closest station to Thong is Sole Street station, roughly 2.2 miles south-west of the centre. Other landmarks nearby include Rochester Castle (4.5 miles east) and Gravesham Museum (2.6 miles north-west). The countryside around Thong includes Rede Common and Gad's Hill.
What we are called out for in Thong
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. Backing rod sets the right depth.
Most people get in touch after spotting something like this:
- Gaps left after new windows were fitted
- Damp patches on the reveal after heavy rain
- Black, perished sealant on frames
- Cold air getting in at the frame edge
Letting a property close to Sole Street station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before you book
- Who turns up on the day
- Whether they’re fully insured
- Whether all the old sealant comes out first
- When the joint can take water or movement
What happens on the day
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a handful of frames, longer for a whole house. Somewhere as small as Thong, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- Tell us if parking is tricky
Getting a quote
We do not publish a price list, because every job is different. Instead, we send you a clear quote for your job. To arrange one, call 0345 464 0079 or email us.
Related advice
When it isn’t the sealant
We will always be straight with you, so here’s what new sealant will not do:
- Damp coming through the wall itself rather than the frame joint
- Soft or decayed wood in the frame
- Faulty window hardware
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly before you book.
Surfaces we seal
- Aluminium frames
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors