Dumfries and Galloway · Scotland
Window Mastic in Gelston
Window mastic in Gelston from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches on the reveal after heavy rain
- Old mastic that has gone black or come away
- Gaps where the sill meets the wall
Window mastic in Gelston, done properly
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that cannot move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you’re dealing with draughty joints inside around the window and cracked sealant at the sill ends, we can put it right.
In and around a place like Gelston, homes range from older stone-built cottages to newer houses. Exposed frames and sills take the full force of wind-driven rain, so the mastic there works hard.
Whatever the size of the job, it’s backed by our one-year guarantee.
- Place
- Gelston (DG7)
- Region
- Dumfries and Galloway
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
What happens on the day
You do not need to clear the whole room or building, only the area right around the joints. We protect the rest, and the work takes a few hours for a handful of frames, longer for a whole house for a typical job. Outdoor work around Gelston depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors is not affected.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Clear items away from the joints we are working on
- Mention any tricky access
- Mention any sign-in or site rules at work premises
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll talk you through the work before giving you a price.
Advice
Common questions in Gelston
Will you come out to Gelston?
Yes, smaller places are covered as well as towns. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
What guarantee comes with window mastic in Gelston?
Every job comes with our one-year guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
When is the sealant fully cured?
It depends on the product and the temperature. We tell you how long to leave it before we go.
Are you insured?
Yes, we’re fully insured.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels, and we are fully insured.
Looking after it afterwards
Joint life depends on how it’s used and looked after. We suggest:
- Ventilate rooms so frames do not stay wet inside
- Don’t paint over the silicone
- Keep drainage slots and sill grooves clear
- Check the mastic once a year
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just drop us a line at info@mrmastic.co.uk.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
When something else is needed
New sealant can’t fix everything, and we will tell you before we start. It will not solve:
- Draughts through the window seals rather than the frame
- A sash or casement that will not close properly
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
What we seal
- Patio & French doors
- Timber windows & doors
- Composite doors
- Aluminium frames
- Window sills
- uPVC windows
Towns and villages near Gelston
Also in Gelston
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We cut it out and start again.
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.
What affects the quote in Gelston
Your quote is based on your job. We look at:
- Which sealant suits the joint
- Any mould that needs treating
- Working hours on commercial sites
- The number and length of the joints
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
What we need to know
To help us quote quickly, please include:
- The rough size of the job
- Whether it has been sealed before
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
Every job is quoted individually. Simply send an email to info@mrmastic.co.uk and describe the job, and pictures are welcome.
What the job involves on each surface
Patio & French doors
Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
Windows and doors in Gelston
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that.
In and around Gelston, as anywhere, good window mastic starts with a clean, dry, properly prepared joint. For an older house near a landmark such as Kirkland Of Gelston, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Gelston is about 17 miles south-west of Dumfries, in Dumfries and Galloway. Every kind of property in Gelston is covered for window mastic, old or new, large or small. Every job comes with our one-year guarantee. 138 places in Dumfries and Galloway are on our list, large and small. There’s also a page for Glasgow, roughly 67 miles from Gelston.
Our applicators cover all of DG7 for window mastic and the streets around it. Local streets include Douglas Terrace and Douglas Crescent, all of which we cover. Other places close to Gelston include Kelton Hill (2 miles west), Castle Douglas (2 miles north), Bridge of Dee (2 miles west), Palnackie (3 miles east) and Dalbeattie (4 miles north-east).
What’s near Gelston
Nearby you will also find Gelston Castle (0.5 miles east) and Castle Douglas Art Gallery (2.4 miles north). Green spaces nearby include Carlingwark Loch.
For landlords and businesses
We work for landlords and letting agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.