Na h-Eileanan Siar · Scotland
Castlebay New Build Mastic
Professional new build mastic in and around Castlebay, with every bit of old sealant taken out first and a 12-month guarantee.
- Sealant that never bonded to the surface
- Kitchen sealant that has pulled off the wall
- Internal frame sealant that has split
New build mastic for homes and businesses in Castlebay
Some owners wait for the first year’s movement before having joints redone. That makes sense for small gaps that are just cosmetic, but a seal that’s letting water through needs doing now. We work on windows & doors, plot handovers and show homes, and people most often call us about cracked sealant around new window and door frames and untidy sealant flagged on a snagging list.
Timber frame is common in newer Scottish homes, and it settles over the first years, which shows as gaps at skirtings and floor joints. Older stone-built homes, meanwhile, often have timber floors that move with the seasons.
Every job is covered by our 12-month guarantee.
- Location
- Castlebay (HS9)
- Region
- Na h-Eileanan Siar
- Cover
- 12 months on all our work
- Quotes
- A clear price before work begins
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What happens if it’s left?
A tube of sealant from the DIY shop will not fix the cause: grit, unprimed surfaces and old layers underneath. Cutting out, cleaning and priming are what make the difference. Exposed walls in smaller Scottish places take a lot of wind and rain, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
No two jobs are quite the same, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Why us?
- We leave the area clean and tidy
- We agree the colour with you first
- A 12-month guarantee on all work
- Homes, businesses and hotels
Read how sealant jobs are priced and customer reviews.
FAQs for Castlebay
Is new build mastic in Castlebay guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Do you cover Castlebay for new build mastic?
Yes, Castlebay is within the area we cover. We work across all of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job, and we’ll send you a clear quote.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
Where is Mr Mastic based?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Can you work from my snagging list?
Yes. Send us the sealant items on the list, with photos if you can. We’ll tell you if anything on it isn’t a sealant job.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
What the job involves on each surface
Kitchens
Worktops in new homes can move slightly as the house dries, opening gaps behind the upstand. We reseal them with a flexible sealant.
Plot handovers
We work through plots to your schedule, sealing each room ready for handover. Each joint is cleaned and primed where needed to keep callbacks down.
Landlords, agents and businesses in Castlebay
For anyone letting property in or around Castlebay, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies keeps a property looking cared for.
Honest limits
New sealant can’t fix everything, and we’d rather say so up front. Sealant will not put right:
- Cracked trays, tiles or worktops
- Movement caused by a poorly fitted tray or bath
- Your warranty claim itself, which is between you and the builder
If you’re not sure, just send an email to info@mrmastic.co.uk and we will give you a straight answer before you book.
Where we work in Castlebay
- Bathrooms & en suites
- Plot handovers
- Kitchens
- Show homes
- Skirting & floors
- Windows & doors
Places near Castlebay
Other services in Castlebay
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.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Signs you need new build mastic in Castlebay
Baths and trays settle under load once the home is lived in. If a bath wasn’t filled when it was sealed, the bead is stretched the first time it’s used.
Most people get in touch when they notice something like this:
- Cracked caulk along new skirting
- Kitchen sealant that has pulled off the wall
- Internal frame sealant that has split
- Beads laid onto grit and dust from the build
Around Castlebay, as everywhere, new build mastic is only as good as the preparation behind it.
What your quote should include
- Are they insured?
- How the colour is chosen
- How hidden problems are handled
- How the surfaces are prepared before sealing
What new build mastic looks like in Castlebay
Castlebay is within about 1 mile of the coast. New homes near the sea put their outside mastic to work from day one, so any gaps are best picked up early. Island jobs need planning around ferries and the weather, so give us as much notice as you can.
For jobs in and around Castlebay, choosing the right material for each joint is as important as a tidy finish.
Castlebay is in Na h-Eileanan Siar. Homes, rented property, offices and hotels in Castlebay is covered for new build mastic, old or new, large or small. The work is guaranteed for a year. Our Na h-Eileanan Siar coverage runs to 87 places, Castlebay among them.
Work in HS9 works the same way as everywhere else we cover. That includes homes and businesses on Pier Road and Rathad na Horgh. We also cover Leideag (1 mile south-east), Bàgh a'Chaisteil (1 mile west), Ceann Tangabhal (1 mile north-west), Brèibhig (1 mile east) and Cuidhir (3 miles north). If you are somewhere remote, the job takes a little more planning.
What’s near Castlebay
A little further out are St Brendan's Hospital (under half a mile south-west) and Museum Bharraigh Agus Bhatarsaidh (less than half a mile north-west). Not far away are Ben Leribreck.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes anything from a few hours to several days, depending on the number of plots, depending on the size of the job. In smaller Scottish places, parking is normally less of an issue than access and distance. Let us know how to find you and how to reach the joints, and the visit is planned around that.
- We start by going through the snagging items or plot schedule with you.
- The failed sealant is removed completely, with no layer left behind.
- We clean out the dust and grit left from the build.
- Primer goes on where the surface and product need it, then the new sealant.
- Each bead is tooled and the cure times explained.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- For indoor joints, keep the area dry beforehand if you can
- Let us know if you’ve seen damp or leaks
Ask for a quote
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will take it from there.