Na h-Eileanan Siar · Scotland
Window Mastic in Steinis
Window and door frames in Steinis need attention? We cut out the old, prepare the joints and apply the right sealant.
- Cracked sealant at the sill ends
- Cracked or shrunken mastic around the frame
- Gaps between the frame and the inside reveal
About our window mastic in Steinis
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. Common call-outs are for gaps where the sill meets the wall and mastic that has split away from the wall, on aluminium frames, composite doors and window sills.
Outdoor sealant needs a dry surface, so window work around Steinis is planned around the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Each job carries a 12-month guarantee, whatever its size.
- Location
- Steinis (HS2)
- Region
- Na h-Eileanan Siar
- Cover
- A year, on every job
- Quotes
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Surface by surface
Composite doors
Composite doors are normally hung in an uPVC-type frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. We use a neutral-cure product.
What affects the quote in Steinis
We quote each job individually. This is what makes a difference:
- The product the joint needs
- Access and height
- Whether there’s mould to deal with
- The amount of work
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
What to tell us for a quote
When you contact us, these details help:
- The type of property
- What’s wrong with the joints now
- Where the job is, and your postcode
- Photos by email, if that’s easy
It all starts with a short chat. Describe the problem, the location and the size of the job. Whenever you’re ready, email us at info@mrmastic.co.uk.
Your questions about window mastic in Steinis
Is window mastic in a coastal place like Steinis any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Is Steinis within the area you cover?
Yes, Steinis is covered. We work across all of Scotland, islands included, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you take out the old sealant first?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can new window sealant be painted?
That depends on the product. Silicone isn’t paintable, but some hybrid sealants are. Mention any painting plans before work begins.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
Can resealing stop a draught around my window?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we will tell you.
Can you do upstairs windows?
Yes, if safe access is possible. For high or awkward windows, we’ll tell you what access is needed.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
What we do, step by step
We work through the job in order: protection first, then preparation, sealing and a tidy-up. For most jobs that takes most of a day for a typical house, less for a few frames, and the area is left clean. For a place like Steinis, longer drives are planned in advance. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- 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 tricky access
- Tell us about any previous sealing or DIY attempts
- Keep children and pets away from the work area
How to get a quote
We don’t publish a price list. Instead, we send you a clear quote for your job. To arrange one, drop us a line at info@mrmastic.co.uk.
Read more
Landlords, agents and businesses in Steinis
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
We also work for property managers and facilities teams. Several sites can be quoted together, and we’re fully insured for the work.
Steinis homes and the weather
Steinis is close to 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. Steinis is in the west of Scotland, which is wetter than the east, so there’s plenty of rain for the mastic around window and door frames to keep out.
Around Steinis, as everywhere, window mastic is only as good as the preparation behind it.
Steinis is in Na h-Eileanan Siar. For window mastic in and around Steinis, please send an email to info@mrmastic.co.uk for a quick quote. We are based in Crawley and cover Na h-Eileanan Siar. Steinis is one of 87 places in Na h-Eileanan Siar we cover for window mastic.
Here we cover the HS2 postcode area for window mastic. If you’re just outside Steinis, we cover Plasterfield (1 mile south-west), Sandwick (1 mile south), Sanndabhaig (1 mile south), Stornoway (1 mile west) and Branahuie (1 mile south-east). Island and remote addresses take a little more planning, so please mention your location when you send an email to info@mrmastic.co.uk.
Around Steinis
Other landmarks nearby include Western Isles Hospital (1.3 miles west) and Lewis Loom Centre (1.5 miles west). Open spaces near Steinis include Loch Àirigh na Lic.
Common problems we fix in Steinis
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Signs it’s time to call us include:
- Old mastic that has gone black or come away
- Mastic that has split away from the wall
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
Whether the job is in Steinis itself or nearby, the right material for each joint matters as much as a neat finish.
What your quote should include
- Whether all the old sealant comes out first
- What guarantee comes with the work
- How hidden problems are handled
- Are they insured?
Also near Steinis
Other services in Steinis
What we can’t put right
In fairness, some problems need a different trade:
- Damp problems in the wall away from the window
- A door that needs adjusting, rehanging or new seals
- Rotten timber, which needs a joiner first
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly before booking.
Where we work in Steinis
- Composite doors
- uPVC windows
- Window sills
- Patio & French doors
- Aluminium frames
- Timber windows & doors
Why it’s worth doing now in Steinis
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. In a place like Steinis, small leaks are easy to put off, but water behind a failed seal does the most damage when nobody’s watching.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, send an email to info@mrmastic.co.uk and we will give you an honest view and a quote.
Why Steinis clients choose us
- Any old sealant cut out fully, not covered over
- 180+ five-star Google reviews
- More than 20 years in sealant work
- We leave the area clean and tidy
Read our cost guide or what customers say.