Hertfordshire · England
Remedial sealant & repairs in Long Marston, Hertfordshire
Removing failed, mouldy or leaking sealant and putting it right for householders, landlords and businesses in Long Marston. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Products that weren’t meant for the joint
- Beads that never stuck properly
- Kitchen joints letting water behind the worktop
About our remedial sealant in Long Marston
Not every leak is a sealant leak. Cracked trays, leaking wastes and faulty valves often look like a sealant problem. When the fault is elsewhere, we say so instead of resealing for the sake of it. Common call-outs are for sealant applied over old sealant that has lifted and torn expansion joints, on leaking tray & enclosure joints, expansion joints and mouldy bath & shower sealant.
Homes around Long Marston are mostly houses and cottages rather than flats. The work is the same as anywhere: old material cut out, joints cleaned and a fresh finish laid.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Where
- Long Marston (HP23)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Leaking trays & enclosures
If the tray is cracked, or the leak is from the valve or waste, sealant won’t fix it. We say so rather than reseal.
Over-sealed & botched joints
Thick, smeared sealant looks messy and hides problems. We strip it back so we can see the joint, then reseal neatly.
What else we do in Long Marston
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
What sealant work cannot fix
To be straight with you, some problems need a different trade:
- Tiles that have come away from the wall
- Sealant in an older building that needs testing for asbestos first
- Plumbing leaks behind walls or under trays
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
What we seal
- Expansion joints
- Mouldy bath & shower sealant
- Botched or over-sealed joints
- Failed movement joints
- Leaking tray & enclosure joints
- Shrunken worktop sealant
Why act early in Long Marston
A joint that has failed twice will fail again unless the cause is dealt with. Finding it, whether movement, water from elsewhere or an unsuitable product, ends the cycle. Around Long Marston, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
What you get with us
- More than 20 years in sealant work
- Full insurance on every job
- Neat joints and a tidy finish
- 12-month guarantee on every job
Read what affects the cost or what customers say.
What affects the cost of remedial sealant
You will get a clear quote before we start. It’s based on:
- The number of rooms or windows
- The number and length of the joints
- How much old sealant there is and how hard it is to remove
- Mould in or behind the old joints
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Asking for a quote
When you contact us, these details help:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or send us an email.
Common problems we fix in Long Marston
Sealant needs a clean, dry surface with no grease on it. Residue, moisture or dust left in the joint weaken the bond, and the joint starts to come away early.
The most common problems we see are:
- Over-sealed joints coming away
- Mould trapped under a layer of silicone
- Caulk or the wrong sealant used in a wet area
- Movement joints that have split or pulled away
For site and facilities teams at buildings such as Long Marston VA Church of England Primary School, washroom and kitchen sealant there needs the same care as at home, and schools and businesses are part of our work as well as homes.
Questions to ask before you book
- The length of the guarantee
- Which colour the sealant will be
- Is VAT in the price?
- Which sealant they’ll use, and why
What we do, step by step
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a typical bath or shower, longer where several layers have been applied, depending on the amount of work. In a small place like Long Marston, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- The failure is looked at first, so we know whether it’s sealant, movement or water from elsewhere.
- 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 are told about anything else we found.
Before we arrive
- On commercial sites, let us know about site rules
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
Getting a quote
If you’re in Long Marston and need remedial sealant, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
Your questions about remedial sealant in Long Marston
Do you cover Long Marston for remedial sealant?
Yes. We work across London and the South East, and Long Marston is part of that. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Do you cover smaller places like Long Marston?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you remove sealant that is been put over old sealant?
Yes. Stripping layered sealant takes longer than a normal reseal, but it’s the only way the new joint will last.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Will there be a smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
What should I tell you?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Remedial sealant in Long Marston: local notes
Most of the South East has hard water, which leaves limescale on sealant, grout and fittings.
Rented homes near Cheddington station change hands often, and botched sealant from a previous quick fix is easier to strip out between tenants. If you live in an older home near Church of All Saints (Church of England), older homes can move a little, which is hard on rigid grout and tired sealant.
Long Marston is about 5 miles east of Aylesbury, in Hertfordshire. From the centre of Long Marston to the outskirts, we cover remedial sealant for every kind of property, from flats and houses to offices and hotels. Our Hertfordshire coverage runs to 381 places, and Long Marston is one of them. We also work in Oxford, around 23 miles away.
All of HP23 is within our area for remedial sealant, from the main roads to the quietest streets. Whether your property is on Station Road, Chapel Lane and Bromley or a nearby road, our applicators can take on the job. If you are just outside Long Marston, we cover Astrope (1 mile south), Puttenham (1 mile south-west), Buckland (2 miles south), Aston Clinton (2 miles south-west) and Wingrave (3 miles north-west). Larger places within reach include Hemel Hempstead (12 miles south-east), Harpenden (15 miles east), Berkhamsted (7 miles south-east), Tring (3 miles south-east), Chorleywood (15 miles south-east) and Grovehill (11 miles south-east).
Local landmarks in Long Marston
Long Marston’s nearest station is Cheddington station, roughly 2.4 miles north-east. A little further out are Tindal Centre (4.4 miles west) and Pitstone Green Museum (2.6 miles east). Green spaces nearby include Ivinghoe Beacon and College Lake nature reserve.