Argyll and Bute · Scotland
Window & door mastic in Kilmun, Argyll and Bute
We cover Kilmun for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Gaps left after new windows were fitted
- Mastic that has split away from the wall
- Draughts coming in around windows and doors
How we handle window mastic in Kilmun
There are two joints on most windows. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. Common call-outs are for rain getting in at the frame or under the sill and leaking joints at the ends of sills, across timber windows & doors, patio & French doors and window sills.
Many older Scottish homes still have timber windows set into stone walls. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
We stand behind the work with a 12-month guarantee, so you’re covered after we’ve gone.
- Location
- Kilmun (PA23)
- Region
- Argyll and Bute
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In an older home around Kilmun, damp from a failed joint can get into timber and plaster.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first and give you a clear quote before work begins.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Quality sealants from Arbo and Everbuild
- We’re fully insured
- ARBOMaster approved applicator
Read what affects the cost or our reviews.
Nearby places to Kilmun
What else we do in Kilmun
Do you need window mastic in Kilmun?
Sun, frost and rain wear sealant out. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
People usually contact us when they notice one of these:
- A bead that does not match the frame
- Untidy mastic left by window fitters
- Mastic that has split away from the wall
- Old mastic that has gone black or come away
Managing a site like Dunoon Grammar School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- What insurance they hold
- Whether you can choose the colour
- The length of the guarantee
- Whether the sealant suits the joint
What the job involves on each surface
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. We’ll point out any rot we find, as that is a job for a joiner.
Windows and doors in Kilmun
Kilmun is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
Homes close to St Munn's Parish Church include some older properties, and the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Kilmun is about 7 miles north-west of Greenock, in Argyll and Bute. Whether you are in the middle of Kilmun or further out, we cover window mastic for every kind of property. Our Argyll and Bute coverage runs to 118 places, and Kilmun is one of them. You can also see our page for Glasgow, roughly 28 miles from Kilmun.
We cover every part of the PA23 postcode area for window mastic and the streets around it. Whether your property is on Midge Lane, Shore Road and Graham's Point or a nearby road, our applicators can take on the job. With the A880 close by, Kilmun is simple for us to get to for window mastic. Close by, we work in 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). Larger places within reach include 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). For island and remote addresses, the job takes a little more planning, so let us know when you get in touch.
Near you in Kilmun
Nearby you’ll also find Castle House Museum (3.5 miles south) and Cowal Community Hospital (2.6 miles south). For a walk, there’s Loch Loskin and Clach Bheinn.
Landlord and commercial work in Kilmun
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
We also work for property managers and facilities teams in Kilmun and across Argyll and Bute. Several sites can be quoted together, and we are fully insured for the work.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Keep paint off silicone joints
- Walk round the house once a year and look at the joints
- Keep timber frames painted
- Use gentle cleaners on frames and sealant
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Paint up to the joint, not over the silicone.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
FAQs for Kilmun
Will you come out to Kilmun?
Yes, we do. Our work covers the whole of Scotland, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do window mastic in Kilmun?
Yes. Our work covers the whole of Scotland, and Kilmun is part of that. You can email us at info@mrmastic.co.uk and let us know what needs doing, and we’ll give you a clear quote.
What should I tell you?
Let us know what needs doing and where, with photos by email if possible. If we need more, we’ll ask.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Can you seal the gap between the frame and the plaster indoors?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we’ll tell you.
Are you ARBOMaster approved?
Yes. We’re ARBOMaster approved, the scheme for applicators of Arbo sealants.
How long before the joint can be used?
That depends on the sealant used, so please follow the time we give you.
What we do, step by step
At the end, we look at the finished work together. The work normally takes a few hours for a handful of frames, longer for a whole house, depending on the size of the job. Around Kilmun, distance and access matter more than parking. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
- Mention any tricky access
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work.