Argyll and Bute · Scotland
Window Mastic in Cairndow
Window mastic across Cairndow and nearby, with old sealant always removed completely.
- White mastic on grey or black frames
- Rain getting in at the frame or under the sill
- Mastic that’s falling out in pieces
How we handle window mastic in Cairndow
Around Cairndow we seal all kinds of frames: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you are dealing with draughts coming in around windows and doors and gaps left after new windows were fitted, we can put it right, on timber windows & doors, composite doors and uPVC windows alike.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Cairndow (PA26)
- Wider area
- Argyll and Bute
- Cover
- A year, on every job
- Quote
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
Cairndow questions
Do you cover Cairndow for window mastic?
Yes. Our work covers the whole of Scotland, and Cairndow is part of that. You can drop us a line at info@mrmastic.co.uk and let us know what needs doing.
Do you cover smaller places like Cairndow?
Yes, smaller places are covered as well as towns. We work across all of Scotland. Let us know about access, parking and anything unusual about getting there when you book.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
How long will my window job take?
It depends on access, the old mastic and the size of the frames. You’ll know the timing when we quote.
I’m a tenant. Can you help?
Yes, though it’s best to check with your landlord first. Landlords are often happy for the work to be arranged.
Can you seal the gap between the frame and the plaster indoors?
Yes, we do both. Inside, the joint between frame and plaster is sealed neatly.
Do you guarantee window mastic?
Yes. Each job is covered for 12 months.
What information do you need?
Tell us what needs doing and where, plus pictures if you have them. If we need more, we’ll ask.
How the job changes by surface
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Patio & French doors
Heavy door frames can move more than windows. The sealant must cope with it, where a rigid one would crack.
Why it’s worth doing now in Cairndow
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. In a place like Cairndow, small leaks are easy to put off, but water behind a failed seal does the most damage when nobody’s watching.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why book with us
- 180+ five-star Google reviews
- A 12-month guarantee on all work
- Approved under the ARBOMaster scheme
- Tidy, careful work
Read our cost guide or customer reviews.
What sealant work cannot fix
We will always be straight with you, so here’s what new sealant will not do:
- Worn gaskets, brush seals or a door that has dropped
- A failed sealed unit that has misted up
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just send an email to info@mrmastic.co.uk and we will give you a straight answer.
Surfaces we seal
- Aluminium frames
- Timber windows & doors
- Composite doors
- Window sills
- Patio & French doors
- uPVC windows
What window mastic looks like in Cairndow
Cairndow is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. Sash and case windows are common in older Scottish homes, often pointed into the wall with traditional sand mastic.
If you live in an older home near Kilmorich Parish Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Cairndow (Gaelic: An Cárn Dubh) is about 19 miles north-west of Helensburgh, in Argyll and Bute. Homes, rented property, offices and hotels in Cairndow can book us for window mastic, old or new, large or small. Every job comes with our 12-month guarantee. Cairndow is one of 118 towns and villages in Argyll and Bute we cover for window mastic. You can also see our page for Glasgow, about 38 miles away.
We cover every part of PA26 for window mastic. Neighbouring places we cover for window mastic include Clachan (2 miles north-east), Inveraray (5 miles west), Inbhir Aora (6 miles west), Lochgoilhead (6 miles south) and Strachur (8 miles south-west). If you are somewhere remote, a little more planning is needed, so mention it when you ask for a quote.
Landmarks near Cairndow
In Cairndow, that means homes and buildings near Cairndow Inn. A little further out are Dunderave Castle (2.4 miles west). Green spaces nearby include Dun na Cuaiche and Loch Restil.
How we quote for window mastic
We do not publish a price list, because no two jobs are the same. The quote depends on:
- Which sealant suits the joint
- The amount of work
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before any work starts.
What to tell us for a quote
What to tell us when you ask for a quote:
- If someone has resealed it before
- A few pictures by email, if you can
- Where the job is, and your postcode
- How we’d reach the joints
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, drop us a line at info@mrmastic.co.uk.
Nearby places to Cairndow
Also in Cairndow
What happens on the day
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before work begins. The work generally takes anything from an hour or two to a full day, depending on how many frames there are. For a place like Cairndow, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
How to prepare
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Tell us if parking is tricky
Get a quote
To get a quote, email us at info@mrmastic.co.uk with the location and a short description of the problem. We will give you a clear price before any work starts.
Read more
Looking after it afterwards
How long the joints last depends on use and care. Here’s what we suggest:
- Repaint timber before it’s bare
- Wash the frames with mild soapy water
- Ventilate rooms so frames do not stay wet inside
- Do not use solvent cleaners on the joint
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
When to call us in Cairndow
Timber windows bring their own problems. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
People usually contact us when they notice something like this:
- Sealant in the wrong colour for the frame
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- Draughty joints inside around the window
In and around Cairndow, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Before you book anyone
- Which sealant they’ll use, and why
- What insurance they hold
- How much experience the applicator has
- Whether you can choose the colour