Buckinghamshire · England
Window & door mastic in Forty Green, Buckinghamshire
Professional window mastic in and around Forty Green, with old sealant always removed completely and a 12-month guarantee.
- Hard, cracked sealant around windows
- Cracked sealant at the sill ends
- Sealant in the wrong colour for the frame
When to call us in Forty Green
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Any of these means the joints need attention:
- Old mastic that has gone black or come away
- Gaps left after new windows were fitted
- Sealant in the wrong colour for the frame
- Water coming in at the bottom corners of a door
If you let a flat or house near Princes Risborough station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- Whether VAT is included
- Whether they’re fully insured
- How hidden problems are handled
- How long the guarantee is
About our window mastic in Forty Green
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We are often asked to deal with leaking joints at the ends of sills and a bead that doesn’t match the frame, across window sills, aluminium frames and timber windows & doors.
Homes in small places like Forty Green often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
All our work is covered by a one-year guarantee, wherever you are in Buckinghamshire.
- Location
- Forty Green (HP27)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Towns and villages near Forty Green
Other services in Forty Green
How the visit works
The work is kept neat and contained to the joints we are treating. The job normally takes most of a day for a typical house, less for a few frames, and we tell you how long to leave it before we go. For a village or hamlet like Forty Green, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Tell us about any water getting in
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
We quote each job on its own. Just call 0345 464 0079 or email us with the details and send photos if you have them.
Related advice
Different surfaces, different methods
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. Those corners get the most care.
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. We prepare and reseal every joint, backing the deep ones.
Windows and doors in Forty Green
Historic houses like Adwell House (about 4.8 miles south-west) are a reminder that the area around Forty Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Historic houses such as Adwell House, about 4.8 miles south-west, show how far back building around Forty Green goes, and older homes nearby need a sealant that suits their walls.
Forty Green is about 4 miles south-east of Thame, in Buckinghamshire. From the centre of Forty Green to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Our area takes in 263 places across Buckinghamshire. Our Oxford page covers work nearby.
We work across the HP27 postcode area for window mastic. We also cover Henton (1 mile south), Holly Green (1 mile east), Skittle Green (1 mile south-east), Pitch Green (1 mile east) and Bledlow (1 mile south-east). Further out, we also cover Aylesbury (7 miles north-east), High Wycombe (9 miles south-east), Chesham (12 miles east), Marlow (12 miles south-east), Amersham (13 miles east) and Beaconsfield (13 miles south-east).
Landmarks near Forty Green
Locally, jobs take us to homes and businesses close to The Peacock Country Inn and the streets around them. The nearest railway station is Princes Risborough station, roughly 2.3 miles east. Other landmarks nearby include Thame Community Hospital (3.4 miles north-west) and Great Kimble Dial Hill (4.1 miles east). Open spaces near Forty Green include Beacon Hill and Oakley Hill nature reserve.
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
What affects the quote in Forty Green
Jobs vary more than people expect. What affects the quote:
- How much there is to do
- How much old sealant there is and how hard it is to remove
- Which sealant suits the joint
- Access and height
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
What to tell us for a quote
To help us quote quickly, please include:
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will explain how we’d tackle it. When it suits you, ring 0345 464 0079 or email us.
Forty Green questions
I let a flat near Princes Risborough station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Do you cover Forty Green for window mastic?
Yes. Our work covers London and the South East, and Forty Green is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
Are you fully insured?
Yes. We’re fully insured.
Is there any odour?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Is the new sealant paintable?
That depends on the product. Some hybrid sealants can be painted; silicone can’t. Mention any painting plans before we start.
Will new mastic stop draughts?
Yes, where the draught is at the frame edge. We check where the draught is before work begins.
Can you seal over the old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we will tell you what we are using.
What we cannot put right
We’ll always be straight with you, so here’s what sealant cannot fix:
- Penetrating damp from a failed cavity tray or render
- Worn gaskets, brush seals or a door that has dropped
- Rotten timber, which needs a joiner first
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before booking.
Where we work in Forty Green
- uPVC windows
- Window sills
- Aluminium frames
- Composite doors
- Timber windows & doors
- Patio & French doors
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Make sure the drainage slots aren’t blocked
- Use gentle cleaners on frames and sealant
- Check the mastic once a year
- Don’t paint over the silicone
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. Resealing closes it.