Na h-Eileanan Siar · Scotland
Sand mastic for sash & case windows in An t-Ob, Na h-Eileanan Siar
Sand mastic in An t-Ob from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Failed mastic on an exposed elevation
- Cracked mastic round a front door frame
- Modern sealant on a period surround
Sand mastic in An t-Ob
Sand mastic skins over fairly quickly, but it takes longer to harden fully. Traditional guidance is not to paint over it, so ask us before you decorate. Typical jobs include draughty sash windows at the surround and old sand mastic that has cracked, crumbled or fallen out, across brick reveals, sash and case windows and timber door frames.
Across smaller places in Scotland, homes range from stone and harled cottages to newer houses, many standing in the open. Exposed frames and sills take the full force of wind-driven rain.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- An t-Ob (HS5)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Why deal with it now?
Before painting the windows, it pays to renew the mastic. Painting over failed mastic doesn’t seal it, and the new mastic is traditionally left unpainted. In an older home around An t-Ob, damp from a failed joint can get into timber and plaster, which is a far bigger job than the sealant.
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote.
Why book with us
- Full insurance on every job
- Rated 4.9 stars on Google
- ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
Read our cost guide or our reviews.
What happens on the day
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes a few hours per window, depending on the condition of the joints in most cases. Somewhere like An t-Ob may be a longer drive, and the journey is planned ahead. Mention tracks, gates, ferries or anything else about the route.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
How to prepare
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
- Keep pets and children clear of the area while we work
Getting a quote
For a quote, drop us a line at info@mrmastic.co.uk and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Read more
How we quote for sand mastic
We quote each job individually. These are the things that affect it:
- The amount of work
- Any working-time requirements on site
- How many rooms, windows or areas are involved
- Any mould that needs treating
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Helping us quote
Before you ask for a quote, have a think about:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Where the property is
- Any previous sealing or DIY work
If you’re in An t-Ob and need sand mastic, email us at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Nearby places to An t-Ob
Also in An t-Ob
How the job changes by surface
Sash and case windows
Sash windows are where we do most sand mastic work. We renew the mastic round each box.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Questions from An t-Ob
Do you cover smaller places like An t-Ob?
Yes, An t-Ob is covered. We work across all of Scotland, islands included, from towns to the smallest places. Longer journeys are simply planned in advance.
Does the coastal weather in An t-Ob affect outside sealant?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Which products do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We explain the product when we quote.
Can I do it myself?
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.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can I choose the sealant colour?
Yes. Sealants come in white, clear, grey and other colours for many products, and we agree the colour with you before any work starts.
What we are called out for in An t-Ob
Sand mastic slowly weathers. It dries out, cracks and loses its grip from the frame or the masonry.
It’s worth asking for a quote if you see:
- Window mastic to renew ahead of painting
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
- Old cement repairs round a window that have failed
Around An t-Ob, as everywhere, sand mastic is only as good as the preparation behind it.
Comparing quotes
- Which sealant they’ll use, and why
- What insurance they hold
- Whether VAT is included
- Whether all the old sealant comes out first
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Frames and glazing around An t-Ob
An t-Ob 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. An t-Ob is in the west of Scotland, which is wetter than the east, which means the mastic around older windows and doors has to cope with a lot of rain.
Whether the job is in An t-Ob itself or nearby, the right material for each joint matters as much as a neat finish.
An t-Ob is in Na h-Eileanan Siar. Every kind of property in An t-Ob can book us for sand mastic, old or new, large or small. Every job comes with our 12-month guarantee. Across Na h-Eileanan Siar, we cover 87 places, An t-Ob among them.
Every address in HS5 is within our area for sand mastic. Whether your property is on Pier Road, Ferry Road and Strond Road or anywhere close by, our applicators can take on the job. We also cover Leverburgh (1 mile south), Ruisgarry (7 miles south-west), Clachan Shannda (10 miles south-west), Direcleit (11 miles north-east) and Tarbert (12 miles north-east). Being one of Na h-Eileanan Siar’s larger places, An t-Ob has every kind of property, from flats to offices. Island and remote addresses take a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
Local landmarks in An t-Ob
Well-known places in the area include Seallam! Visitor Centre (2.3 miles north-west). Open spaces near An t-Ob include Loch Steisevat and Roineabhal.
What sealant work cannot fix
It helps to know what we cannot do too:
- Crumbling stone or brickwork round the window
- Decisions on consent for listed homes
- Decayed frames that need repair
Not sure which it is? You can email us at info@mrmastic.co.uk and we’ll tell you honestly before you book.
What we seal
- Stone surrounds
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Sash and case windows