Na h-Eileanan Siar · Scotland
Remedial Sealant in Knock
Removing failed, mouldy or leaking sealant and putting it right for householders, landlords and businesses in Knock. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Smears and lumps from a botched reseal
- Mould trapped under a layer of silicone
- Worktop sealant that has shrunk and split
Remedial sealant for homes and businesses in Knock
Some sealant jobs aren’t a simple reseal, because someone has already had a go. New sealant over old, smeared beads, unsuitable products and hidden mould all need stripping out. Common call-outs are for kitchen joints letting water behind the worktop and smears and lumps from a botched reseal, on leaking tray & enclosure joints, mouldy bath & shower sealant and botched or over-sealed joints.
In and around a place like Knock, homes range from older stone-built properties to newer houses. Where a building moves, cracked grout and split sealant are usually the first signs.
Whatever the size of the job, it’s backed by our 12-month guarantee.
- Where
- Knock (HS2)
- Wider area
- Na h-Eileanan Siar
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
How to look after the new joints
To keep the joints looking good and working properly:
- Don’t add new sealant on top of old
- Report a tray that rocks or a worktop that lifts
- Clean sealant with mild products only
- Deal with small splits early
Ventilation keeps mould away from the new bead: use the extractor or open a window after showering.
Mould under a second layer of sealant keeps growing out of sight. When it finally shows, the whole bead needs to come out.
What else we do in Knock
How the visit works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for most joints, depending on how much old sealant has to come out and we leave things clean and tidy. Somewhere like Knock 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.
- First we work out whether the problem is the sealant, movement or a leak.
- Old beads and residue are removed down to clean surfaces.
- We treat any mould and dry the joint thoroughly.
- We reseal with a product suited to the joint, backed where needed.
- The joint is tooled and you’re told about anything else we found.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
- Mention any tricky access
Ask for a quote
For a quote, send an email to info@mrmastic.co.uk and tell us where the job is and what the problem looks like. You’ll have a clear quote before we start.
Related advice
Knock homes and their sealant
Knock is close to the coast. Coastal homes, holiday lets and guest houses can see heavy bathroom use in busy months, and sealant and grout that work that hard wear out sooner. Private landlords in Scotland must be registered and meet the Repairing Standard, which covers keeping fixtures and fittings in a reasonable state of repair. Failed sealant around a bath or shower is worth sorting between tenancies.
In and around Knock, as anywhere, good remedial sealant starts with a clean, dry, properly prepared joint.
Knock (Gaelic: An Cnoc) is in Na h-Eileanan Siar. Every kind of property in Knock is covered for remedial sealant. Every job comes with our one-year guarantee. Knock is one of 87 places in Na h-Eileanan Siar we cover for remedial sealant.
Every address in HS2 is covered for remedial sealant. If you need remedial sealant at a property on Seaview and A' Chnuic or a nearby road, our applicators can take on the job. Being close to the A866, Knock is easy for our applicators to reach for remedial sealant. Close by, we work in Na h-Eileanan an Iar (1 mile west), Aiginis (1 mile west), Lower Bayble (1 mile east), Garrabost (2 miles north-east) and Pabail Uarach (2 miles east). For island and remote addresses, the job takes a little more planning, so mention it when you ask for a quote.
Around Knock
Well-known places in the area include Western Isles Hospital (4.5 miles west).
Landlord and commercial work in Knock
For anyone letting property in or around Knock, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
We also work for property managers and facilities teams in Knock and across Na h-Eileanan Siar. Several sites can be quoted together, and we’re fully insured.
Common questions in Knock
Do you cover Knock for remedial sealant?
Yes. We work across all of Scotland, and Knock is part of that. Just email us at info@mrmastic.co.uk with a few details of the job, and we’ll give you a clear price.
Will you come out to Knock?
Yes. Knock is within the area we cover, which takes in towns, villages and rural addresses. We work across all of Scotland, including the islands, where work is planned around ferry crossings. Let us know about access, parking and anything unusual about getting there when you book.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so any old material comes out before anything new goes in.
Can you reseal a split movement joint?
Yes. Where mortar or filler has been used instead of sealant, it’s removed where it can be, then the joint is sealed properly.
Can you strip sealant from an acrylic tray safely?
Yes. We take our time over removal, particularly on softer surfaces like acrylic.
Do you work for letting agents?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
Someone sealed over the old bead. Can you fix it?
Yes. We remove every layer; new silicone does not bond to old silicone, which is why over-sealing fails.
Where are you based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Should I try it myself first?
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
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. Everything old must be removed first.
When to call us in Knock
One of the commonest remedial jobs is sealant on top of sealant. Silicone doesn’t bond to silicone, so the new layer peels, and damp and mould settle between them.
These are the problems we are asked about most:
- Thick, messy sealant smeared over tiles
- Kitchen joints letting water behind the worktop
- Black mould underneath the bead
- Floor or wall movement joints that have failed
Whether the job is in Knock itself or nearby, the right material for each joint matters as much as a neat finish.
What your quote should include
- Who turns up on the day
- Whether the sealant suits the joint
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
Quotes for remedial sealant in Knock
For a quick quote, just ask. The main things that affect it are:
- Any mould that needs treating
- How easy the joints are to reach
- The old material and how stubborn it is
- Any working-time requirements on site
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we will explain what it covers.
What we need to know
What to tell us when you ask for a quote:
- The rough size of the job
- Any previous sealing or DIY work
- What’s wrong with the joints now
- The address or postcode of the job
For remedial sealant in Knock, drop us a line at info@mrmastic.co.uk. Tell us what the problem is and where, and we’ll agree the price before any work begins.
What we cannot put right
Sealant is not the answer to every problem, and we’ll tell you before work begins. Sealant will not put right:
- A bath, tray or worktop that moves until it’s properly fixed
- Cracks in the fitting rather than the joint
- Tiles that have come away from the wall
If you are not sure, just email us at info@mrmastic.co.uk and we will give you a straight answer before booking.
Surfaces we seal
- Expansion joints
- Leaking tray & enclosure joints
- Shrunken worktop sealant
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Failed movement joints