Perth and Kinross · Scotland
St David's Sand Mastic
Sand mastic across St David's and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Failed mastic on an exposed elevation
- Old cement repairs round a window that have failed
- Silicone on a period window that looks wrong
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Crumbling stone or brickwork round the window
- Timber that has rotted
- Cracked or broken glass
Not sure which it is? You can send an email to info@mrmastic.co.uk and we will tell you honestly before you book.
What we seal
- Brick reveals
- Stone surrounds
- Timber door frames
- Sash and case windows
- Period & listed homes
- Tenement windows
Sand mastic in St David's
Our applicators renew the sand mastic around sash and case windows and doors in stone and brick. Out comes the old, loose mastic, the joint is prepared and new mastic is shaped by hand. Typical jobs include draughts and rain around sash boxes and mastic round period door frames that has failed, on stone surrounds, timber door frames and sash and case windows.
Older stone-built homes in Scotland often have sash and case or timber windows set in stone. Those suit a traditional sand mastic or a neutral-cure sealant, not an acetoxy silicone that can attack some stone.
Every job comes with our 12-month guarantee.
- Place
- St David's (PH7)
- Region
- Perth and Kinross
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Towns and villages near St David's
What else we do in St David's
St David's homes and the weather
Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that. Sash and case windows are common in older Scottish homes, and the joint between the box frame and the stone or render is traditionally pointed with sand mastic.
Around St David's, as everywhere, sand mastic is only as good as the preparation behind it. For jobs in and around St David's, choosing the right material for each joint is as important as a tidy finish.
St David's is about 10 miles west of Perth, in Perth and Kinross. St David's gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. St David's is one of 107 towns and villages in Perth and Kinross where we work for sand mastic. We also work in Dundee, about 29 miles from St David's.
Jobs for sand mastic in PH7 works the same way as everywhere else we cover. If you are just outside St David's, we cover Madderty (1 mile north-east), Balgowan (3 miles north-east), Aberuthven (4 miles south-east), Gilmerton (4 miles north-west) and Tullibardine (4 miles south). Within a short drive, we also cover Perth (10 miles east), Crieff (5 miles west), Kinross (15 miles south-east), Letham (9 miles east), Scone (12 miles east) and Tulloch (10 miles east).
Local landmarks in St David's
Well-known places in the area include Strathallan Castle (3.5 miles south-west) and St Margaret's Hospital (4.9 miles south).
DIY sealant or a professional job?
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
The biggest DIY mistake is sealing over old sealant. 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.
Common questions in St David's
Is there a guarantee on sand mastic in St David's?
All our work, in St David's and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Do you cover smaller places like St David's?
Yes. St David's is within the area we cover, which takes in towns, villages and rural addresses. Our work covers the whole of Scotland. Just mention lanes, gates or anything else about the route when you book.
Can you quote for more than one area?
Of course. Doing several areas at once is usually more efficient, so mention them when you ask for a quote.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We’ll tell you what we are using and why.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that normally means someone at home.
What exactly is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
How long does sand mastic take to go off?
It takes a while. The skin forms first, and the full set comes later and we will give you an idea for your job.
What happens on the day
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to a full day, depending on how many windows. For a place like St David's, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic isn’t too thick.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
Before we arrive
- Tell us about any previous sealing or DIY attempts
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
Get a quote
We quote each job on its own, so start by telling us what you need. Simply send an email to info@mrmastic.co.uk and describe the job and send photos if you have them.
Related advice
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Ask a joiner to look at soft timber first
- Ask us before painting near the mastic
- Take care around the mastic when scraping paint
- Plan mastic work ahead of painting
Check the mastic when you check the paintwork. Catching cracks early keeps repairs small.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall so early renewal protects both.
Why act early in St David's
Silicone might seem the quicker option, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. 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.
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please drop us a line at info@mrmastic.co.uk and we’ll talk you through it.
Why St David's customers choose us
- Arbo and Everbuild products
- 12-month guarantee on every job
- We leave the area clean and tidy
- Any old sealant cut out fully, not covered over
Surface by surface
Period and listed homes
Period homes look their best with traditional materials, and sand mastic is one of them.
Sash and case windows
A sash window’s box frame sits in the masonry opening. Sand mastic seals the joint round it.
Quotes for sand mastic in St David's
For a quick quote, just ask. The main things that affect it are:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- Mould in or behind the old joints
- Whether the work is at height
What it costs depends on the amount of work, how much old material has to come out and access to the work. We give a clear quote before we start.
Helping us quote
There’s no need for technical detail. Just tell us:
- Whether it has been sealed before
- Access, such as stairs, a lift or height
- The rough size of the job
- Photos by email, if that is easy
If you are in St David's and need sand mastic, send an email to 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.