Argyll and Bute · Scotland
Sand mastic for sash & case windows in Port Charlotte, Argyll and Bute
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Port Charlotte, backed by a 12-month guarantee. Ask us for a quote.
- Open joints round the window box
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
Work for landlords, hotels and businesses
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
If you manage several properties in or around Port Charlotte, several properties can go on one quote. Send us the addresses and the work at each.
Sand mastic in Port Charlotte, done properly
Fresh sand mastic forms a skin quite soon but full hardening takes longer. Traditionally, sand mastic is left unpainted and we will advise if you are redecorating. We work on tenement windows, brick reveals and sash and case windows, and people most often call us about modern sealant on a period surround and mastic that needs renewing before redecorating.
Outdoor sealant needs a dry surface, so window work around Port Charlotte is planned around the weather, and longer journeys are planned in advance. Let us know about access to every frame, including any upstairs.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Port Charlotte (PA48)
- Wider area
- Argyll and Bute
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Port Charlotte questions
Is Port Charlotte in your area for sand mastic?
Yes. Our work covers the whole of Scotland, and Port Charlotte is part of that. Just send an email to info@mrmastic.co.uk with a few details of the job.
Is sand mastic in a coastal place like Port Charlotte any different?
Near the coast, wind-driven rain and, nearer the shore, salt air make outside sealant work harder. The right product, a clean joint and the right depth all help it cope.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. We use products from Arbo and Everbuild.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Can old silicone round a sash window be swapped for sand mastic?
Generally, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Do I need permission for sand mastic on a listed building?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Which is right for my windows, sand mastic or modern sealant?
That depends on your windows. Period windows in stone or brick normally suit sand mastic and newer frames generally get a flexible sealant.
Port Charlotte homes and the weather
Port Charlotte 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 older windows and doors, which can dry out and crack sooner where a building faces the weather. The west of Scotland is wetter than the east, which means the mastic around older windows and doors has to cope with a lot of rain.
Around Port Charlotte, as everywhere, sand mastic is only as good as the preparation behind it.
Port Charlotte (Gaelic: Port Sgioba) is in Argyll and Bute. Whether you’re in the middle of Port Charlotte or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. We cover 118 towns and villages across Argyll and Bute, from the larger towns to small villages.
Work in PA48 is quoted and booked the same way as anywhere else. That includes homes and businesses on Main Street, Rhu Road and Shore Street. Port Charlotte sits on or near the A847, so getting to you is simple. Neighbouring places we cover for sand mastic include Bowmore (4 miles east), Portnahaven (6 miles south-west), Bun Othan (7 miles south-west), Imeraval (10 miles south-east) and Port Ellen (11 miles south-east). For island and remote addresses, the job takes a little more planning, so mention it when you ask for a quote.
Landmarks near Port Charlotte
Other landmarks nearby include Loch Gorm Castle (4.7 miles north) and Museum of Islay Life (under half a mile north). Not far away are Beinn Tart a' Mhill and Loch Gorm.
Different surfaces, different methods
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. If your home is listed, ask your local planning authority about consent.
Tenement and terrace windows
Upper-floor windows need access planning. Let us know the floor and we’ll confirm access.
What we do, step by step
At the end, we look at the finished work together. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. Outside jobs in Port Charlotte need a dry day, because sealant will not bond to a wet joint, so external jobs may need to move if the day turns wet. Indoor work goes ahead whatever the weather.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Clear the area around the work
- Mention any parking rules near the property
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Advice
Signs you need sand mastic in Port Charlotte
Rain on the window surround works into any crack and pushes it out. Windows facing the weather tend to go first.
People normally contact us after spotting something like this:
- Patchy fillers round a sash window
- Draughts and rain around sash boxes
- Gaps where the frame meets the masonry
- Failed mastic on an exposed elevation
If you live in an older home near St Kiaran’s Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Questions to ask before you book
- How hidden problems are handled
- The length of the guarantee
- Whether you can choose the colour
- Whether they’re fully insured
Towns and villages near Port Charlotte
Also in Port Charlotte
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Sashes that rattle, stick or won’t open
- Masonry that needs repairing
- Broken panes
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
Surfaces we seal
- Brick reveals
- Stone surrounds
- Tenement windows
- Period & listed homes
- Timber door frames
- Sash and case windows
Why deal with it now?
New mastic over crumbling mastic will not hold. We remove the loose material first so the new work lasts. Out of town in Scotland, exposed walls take a lot of weather, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs. Call for a quick quote and we’ll go through it with you.
Why Port Charlotte clients choose us
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
- We never seal over old sealant
- Approved under the ARBOMaster scheme
Take a look at what affects the cost and our reviews.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.