Dumfries and Galloway · Scotland
External & façade joints in New Galloway, Dumfries and Galloway
External mastic for New Galloway and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Old sealant gone brittle and cracked
- Brick movement joints where the sealant has split
- Gaps where render, brick and frames meet
DIY versus a professional finish
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.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How we handle external mastic in New Galloway
On houses, flats and commercial buildings across New Galloway, we reseal joints in brickwork, render, cladding and façade panels. Every joint gets the same careful preparation: clean, sound faces and a controlled depth. If you are dealing with hard, crazed mastic that has stopped moving and cracked joints where brick meets render or frames, we can help.
Outside joints can only be sealed when they’re dry, so work in New Galloway depends on the weather. Let us know about access to every wall and roofline.
There’s a 12-month guarantee on every job.
- Location
- New Galloway (DG7)
- Region
- Dumfries and Galloway
- Cover
- A year, on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Aftercare tips
A little care helps the new joints last. Our advice:
- Never let anyone fill a movement joint with mortar
- Ask before painting over external sealant
- Look over the joints every year, ideally after winter
- Tell anyone working on the walls about the movement joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.
Leave it or put it right?
A failed movement joint lets water into the wall and can run behind render or cladding. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water through a failed joint keeps working away until it’s fixed.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- A sealant colour to suit the surroundings
- We’re fully insured
- Experience in homes, commercial sites and hotels
- Every job guaranteed for a year
Take a look at our cost guide and our reviews.
Different surfaces, different methods
Cladding and façade panels
If the façade has a specified sealant, that’s what we use or an approved alternative. Send us any details you have about the façade.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so neither cracks the other.
Towns and villages near New Galloway
Other services in New Galloway
The process
There’s no need to move everything out, just the space around the work. We protect the rest, and the job takes a few hours to a few days, depending on the length of joint and the access in most cases. In smaller Scottish places, parking is normally less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
Getting a quote
Getting a quote is simple: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
Advice
Outside joints around New Galloway
Harled (roughcast) walls are common in Scotland, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface. The west of Scotland is wetter than the east, so there’s plenty of rain for movement joints and outside wall joints to keep out.
In and around New Galloway, as anywhere, good external mastic starts with a clean, dry, properly prepared joint. Whether the job is in New Galloway itself or nearby, the right material for each joint matters as much as a neat finish.
New Galloway is about 21 miles west of Dumfries, in Dumfries and Galloway. We carry out external mastic for homes and businesses in New Galloway. We cover 138 towns and villages across Dumfries and Galloway. Our Glasgow page covers work nearby.
Work in DG7 is quoted and booked the same way as anywhere else. That includes homes and businesses on High Street, Kirk Road and Old Edinburgh Road and the roads around them. New Galloway is on the A712 and A762, so it’s easy for us to get to. Neighbouring places we cover for external mastic include St John's Town of Dalry (2 miles north), Crossmichael (9 miles south-east), Glenlochar (10 miles south-east), Moniaive (12 miles north-east) and Castle Douglas (12 miles south-east). Further out, we also cover Gatehouse of Fleet (13 miles south), Creetown (15 miles south-west) and Minnigaff (15 miles south-west).
Near you in New Galloway
A little further out are Kenmure Castle (0.8 miles south). Open spaces near New Galloway include Little Kenmure Loch.
Common questions in New Galloway
What guarantee comes with external mastic in New Galloway?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Do you cover New Galloway for external mastic?
Yes, New Galloway is within the area we cover. We work across all of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we’ll send you a clear quote.
What do you need from me for a quote?
Tell us what needs doing and where. If we need more, we’ll ask.
Where do you work from?
We’re a Crawley-based firm. We work across South East England, London and Scotland.
Which products do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Do you have insurance?
Yes. Full insurance covers our work.
How do I get a quote for external mastic in New Galloway?
Every job is different, so each one gets its own quote. To get one, drop us a line at info@mrmastic.co.uk with a short description of the job.
I rent my home. Can I book you?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Quotes for external mastic in New Galloway
There’s no set price list. What we look at:
- Which sealant suits the joint
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote.
What we need to know
To make quoting easier, let us know:
- Pictures of the joints, sent by email
- What’s wrong with the joints now
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
For a quote, drop us a line at info@mrmastic.co.uk with the location and a short description of the problem. You’ll have a clear quote before any work starts.
When something else is needed
In fairness, there are a few things sealant won’t fix:
- Cracks in the bricks or render themselves, away from the joints
- Rising or penetrating damp from elsewhere in the wall
- Loose or hollow render, which needs re-rendering
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we will tell you honestly before you book.
Surfaces we seal
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Render & cladding joints
- Concrete & block
- Façade panels