Argyll and Bute · Scotland
External & façade joints in Kilmun, Argyll and Bute
External mastic for Kilmun, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
- Brick movement joints where the sealant has split
Quotes for external mastic in Kilmun
Jobs vary more than people expect. The main factors:
- The amount of work
- Access and height
- Any working-time requirements on site
- The number of rooms or windows
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part.
What we need to know
When you call or email, it’s useful to know:
- The rough size of the job
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- If it’s domestic, commercial or a hotel
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email pictures if that is easy.
How we handle external mastic in Kilmun
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible sealant bridges the two where mortar or filler would crack. We work on concrete & block, joints between brick and frames and brickwork movement joints, and people most often call us about rain getting behind render or cladding at a joint and leaking joints around cladding and façade panels.
External sealant needs dry surfaces, so outdoor work around Kilmun is planned around the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Kilmun (PA23)
- Wider area
- Argyll and Bute
- Cover
- A year, on every job
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Common questions in Kilmun
Is Kilmun in your area for external mastic?
Yes, Kilmun is within the area we cover. Our work covers the whole of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear quote.
Is Kilmun within the area you cover?
Yes, we do. We work across all of Scotland, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Can you do several jobs on one visit?
Yes, we can. More than one area can go on one quote.
Do you seal joints where cladding meets other materials?
Yes. We cut out the old sealant, prepare both faces and reseal with a flexible exterior product. We pick a colour that works with both materials.
How long does external mastic take?
As a guide, most jobs take anything from a few hours to several days, depending on the building. Bigger jobs take longer, and we’ll tell you how long to expect.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you work on commercial sites?
Yes. We’ve worked for hotels, offices and other businesses and we are fully insured.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Signs you need external mastic in Kilmun
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
The most common problems we see are:
- Gaps where render, brick and frames meet
- Old sealant gone brittle and cracked
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
If you look after a building such as Dunoon Grammar School, larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- Are they insured?
- What happens if they find a problem under the old sealant
- Whether all the old sealant comes out first
- What product goes in the joint
Landlords, agents and businesses in Kilmun
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Landlords and letting agents in Kilmun can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Deal with leaking gutters that soak the joints below
- Keep soil, plants and ivy away from the joints
- Check external joints each spring
- Wash walls gently around the sealant
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
DIY versus a professional finish
If you are 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 fails, we can still redo it.
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Outside joints around Kilmun
Kilmun is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. Plenty of Scottish homes have harled walls, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
If you live in an older home near St Munn's Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Kilmun is about 7 miles north-west of Greenock, in Argyll and Bute. Our applicators cover external mastic for homes and businesses in Kilmun, as part of our work across Argyll and Bute. Kilmun is one of 118 towns and villages in Argyll and Bute we cover for external mastic. There’s also a page for Glasgow, about 28 miles away.
Here we cover the PA23 postcode area for external mastic. That includes homes and businesses on Midge Lane, Shore Road and Graham's Point and the roads around them. With the A880 close by, Kilmun is easy for our applicators to reach for external mastic. Other places close to Kilmun include Tom nan Ragh (1 mile west), Sandbank (1 mile south), Strone (2 miles south-east), Hunters Quay (3 miles south-east) and Kirn (3 miles south-east). Further out, we also cover Helensburgh (8 miles east), Rothesay (12 miles south), Rhu (7 miles east), Garelochhead (7 miles north-east), Port Bannatyne (11 miles south-west) and Innellan (7 miles south). If you’re somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
What’s near Kilmun
Well-known places in the area include Castle House Museum (3.5 miles south) and Cowal Community Hospital (2.6 miles south). Green spaces nearby include Loch Loskin and Clach Bheinn.
Places near Kilmun
More services for Kilmun
How the visit works
A visit follows a simple pattern: we look at the joints together, protect the area around them, do the work and clear up. It generally takes anything from a few hours to several days, depending on the building. In smaller Scottish places, parking is normally less of an issue than access and distance. Tell us how to find the property and how to reach the work.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
- Mention any sign-in or site rules at work premises
Get a quote
Want a quote for external mastic? Please drop us a line at info@mrmastic.co.uk with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Advice
Surface by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it before the bead.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.