Aberdeenshire · Scotland
Muchalls External Mastic
Our applicators work in Muchalls on sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
Why act early in Muchalls
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost, so the damage spreads beyond the joint. When the nearest tradesperson is a drive away, it’s tempting to leave a small leak, but water behind a failed seal does the most damage when nobody’s watching.
We don’t show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
What you get with us
- 180+ five-star Google reviews
- We agree the colour with you first
- Arbo and Everbuild products
- Homes, businesses and hotels
Read what affects the cost or our reviews.
About our external mastic in Muchalls
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the joint doesn’t stand out. We work on joints between brick and frames, copings & trims and concrete & block, and people most often call us about plants rooting in failed movement joints and panel joints letting water in.
Stone walls need a stone-friendly sealant, as acetoxy products can attack some stone. On newer homes, the movement joints and roofline trims are what need watching.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Muchalls (AB39)
- Region
- Aberdeenshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
How the visit works
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes a few hours for a handful of joints, longer for a whole elevation for a typical job. Somewhere like Muchalls may be a longer drive, and the journey is planned ahead. Tell us about tracks, gates, a ferry crossing or anything unusual about getting there.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Mention if the joints have been sealed before
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
How to get a quote
Asking for a quote is easy: let us know the job and the location. A few photos by email make the job easier to understand, and we’ll come back to you with a quote.
Related advice
Nearby places to Muchalls
Also in Muchalls
Walls and rooflines in Muchalls
Muchalls is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Harled (roughcast) walls are common in Scotland, and where harling meets frames, pipes and other materials, the joint needs a flexible sealant that grips a rough surface.
For an older house near a landmark such as Saint Ternan's Church, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Muchalls is about 9 miles south of Aberdeen, in Aberdeenshire. Whether you are in the middle of Muchalls or further out, we cover external mastic for every kind of property. Muchalls is one of 161 towns and villages in Aberdeenshire we cover. There’s also a page for Aberdeen, about 9 miles away.
We work across AB39 for external mastic and the streets around it. Local streets include Pheppie Road, Dunnyfell Road and Monduff Road. We also cover the places around Muchalls: Newtonhill (1 mile north-east), Chapelton (1 mile north-west), Cammachmore (2 miles north), Portlethen (3 miles north) and Portlethen Village (3 miles north-east). Further out, we also cover Westhill (10 miles north-west), Stonehaven (4 miles south-west), Banchory (13 miles west), Inverbervie (13 miles south) and Elrick (10 miles north-west).
What’s near Muchalls
The nearest railway station is Portlethen station, roughly 3 miles north-east. Nearby you’ll also find Cowie Castle (3.4 miles south) and Kincardine Community Hospital (4.4 miles south-west). The countryside around Muchalls includes Hill of Muchalls and Portlethen Moss.
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Get split or bare joints resealed while the damage is small
- Make sure movement joints are not pointed over
- Avoid pressure-washing directly into sealant joints
- Check external joints each spring
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years, so it’s worth resealing at the first signs.
Surface by surface
Concrete and blockwork
Big joints in concrete need careful depth control. Backing rod sized to the joint sets it.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best in all weathers.
When to call us in Muchalls
Sunlight, wet weather and frost wear exterior sealant down. In time it goes hard, crazes on the surface and stops stretching, so the next time the wall moves, it splits or pulls away.
People generally contact us when they notice something like this:
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
Letting a property close to Portlethen station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
What your quote should include
- How hidden problems are handled
- What the cure time is
- Whether all the old sealant comes out first
- Are they insured?
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- The old material and how stubborn it is
- How many areas need sealing
- Access and height
- The size of the job
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, email us at info@mrmastic.co.uk and we will give you an honest view and a quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- The type of property
- Photos by email, if that’s easy
- The address or postcode of the job
- Whether it has been sealed before
If you’re in Muchalls and need external mastic, email us at info@mrmastic.co.uk. A short description of the job and where it is helps us quote, and you will get a clear quote before work begins.
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Common questions in Muchalls
Does living near the coast affect external mastic in Muchalls?
Near the sea, outside joints face more wind, rain and salt than they would inland, so the choice of sealant and the preparation matter even more. Walls facing the sea are usually the first to need attention.
Can you help a landlord with a rental near Portlethen station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can send an email to info@mrmastic.co.uk with the details for a clear quote.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only.
Do you come to Muchalls?
Yes, we do. Our applicators work in Muchalls, and the service is the same as everywhere else.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Muchalls, along with the rest of our area.
Is the work guaranteed?
Yes, for a year. If there’s a problem with our work in that time, tell us and we will put it right.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so the joint doesn’t draw the eye.