Argyll and Bute · Scotland
External Mastic in Kilmartin
External mastic for Kilmartin, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Joints where the bead has come unstuck
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
What we can’t put right
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Movement that is more than a sealant joint can take
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, drop us a line at info@mrmastic.co.uk and we’ll say what we think before booking.
Joints and surfaces we work on
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
How we handle external mastic in Kilmartin
A movement joint is a deliberate break that lets a wall expand and contract. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. Common call-outs are for sealant that has lost its bond to the brick or render and hard, crazed mastic that has stopped moving, across façade panels, render & cladding joints and brickwork movement joints.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. On newer homes, the movement joints and roofline trims are what need watching.
The work is covered for a year after we finish. If anything is not right with it, email us at info@mrmastic.co.uk.
- Place
- Kilmartin (PA31)
- Region
- Argyll and Bute
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Nearby places to Kilmartin
What else we do in Kilmartin
How we quote for external mastic
For a quick quote, just ask. What matters most is:
- Whether there’s mould to deal with
- How much there is to do
- How many rooms, windows or areas are involved
- How easy the joints are to reach
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Ask us for a quote and we will go through it with you.
What we need to know
There’s no need for technical detail. It helps if you can tell us:
- The address or postcode of the job
- Pictures of the joints, sent by email
- The rough size of the job
- The problem you’ve noticed
Every job is quoted individually. Simply email us at info@mrmastic.co.uk and describe the job, and photos are welcome.
Do you need external mastic in Kilmartin?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
People normally contact us after spotting one of these:
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Sealant pulling away from one side of the joint
- Failed seals between different materials
For an older house near a landmark such as Kilmartin Parish Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Comparing quotes
- What happens if the job turns out different
- What the cure time is
- Are they insured?
- What the quote includes, VAT included or not
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The visit itself normally takes anything from a few hours to several days, depending on the building, depending on how much there is to do. Outdoor work around Kilmartin depends on the weather, as sealant needs a dry surface, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
- Tell us if parking is tricky
Get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job.
Advice
Aftercare tips
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Keep water from gutters off the wall
- Keep movement joints as flexible joints, not mortar
- Ask before painting over external sealant
Give the sealant the cure time we tell you before anything rubs against it. Most exterior sealants skin fast but take longer to cure right through.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
DIY versus a professional finish
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.
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 doesn’t work out, we can still put it right.
Questions from Kilmartin
Will you come out to Kilmartin?
Yes, Kilmartin is covered. We work across all of Scotland, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Kilmartin?
Yes, Kilmartin is within the area we cover. We work across all of Scotland. Just email us at info@mrmastic.co.uk with a few details of the job, and we will give you a clear price.
Do you have insurance?
Yes, we are fully insured.
Is it OK to seal over old sealant?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Do you work for landlords and businesses?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels.
Can I add another job to the visit?
Yes. Just list everything you need.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
How long before the joint can be used?
Most sealants are touch-dry well before they’re fully cured. We will give you the cure time for the product we used before we leave.
Kilmartin buildings and the weather
Kilmartin is within about 3 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and sound outside sealant is part of that.
Around Kilmartin, as everywhere, external mastic is only as good as the preparation behind it.
Kilmartin is about 30 miles north-west of Greenock, in Argyll and Bute. Kilmartin gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Across Argyll and Bute, we cover 118 places, and Kilmartin is one of them. For nearby work, see our Glasgow page (51 miles or so).
We work across the PA31 postcode area for external mastic and the streets around it. Close by, we work in Kilmichael Glassary (4 miles south-east), Ardfern (4 miles north-west), Bridgend (4 miles south), Cairnbaan (5 miles south) and Barravullin (5 miles north). Larger places within reach include Ceann Loch Gilb (7 miles south), Lochgilphead (7 miles south) and Ardrishaig (8 miles south). For island and remote addresses, a little more planning is needed, so let us know when you get in touch.
What’s near Kilmartin
Nearby you will also find Carnasserie Castle (1.2 miles north) and Kilmartin Museum (less than half a mile south-west). The countryside around Kilmartin includes Lochan Add and Druim an Achanarnich.
Why act early in Kilmartin
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
Why Kilmartin customers choose us
- We never seal over old sealant
- Colour picked to suit the job
- Homes, businesses and hotels
- We agree the colour with you first
Read what affects the cost and customer reviews.