Kent · England
Glazing & conservatory sealant in Cobham, Kent
Glazing silicone for Cobham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Glazing silicone that has cracked or come away
- Cracked silicone between glass panels
- A quick top-up bead that didn’t last
About our glazing silicone in Cobham
Glass and frames expand and contract differently, and the silicone between them takes the strain. Once it splits or comes away, water finds a way through. We replace it with a glazing silicone that suits the glass and frame. We work on rooflights, shower screens and conservatory frames, and the jobs we see most are water getting into a conservatory at the joints and glass-to-glass joints that have split.
Homes in small places like Cobham often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
All our work is covered by our one-year guarantee.
- Where
- Cobham (DA12)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
A leaking joint won’t fix itself. Water can damage frames, walls, flooring and furniture, so it pays to deal with it early. Around Cobham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Cobham
- Experience in homes, commercial sites and hotels
- Approved under the ARBOMaster scheme
- Trusted Arbo and Everbuild sealants
- Rated 4.9 stars on Google
Read our cost guide and what customers say.
Quotes for glazing silicone in Cobham
For a quick quote, just ask. The main things that affect it are:
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
- The size of the job
- Any mould that needs treating
Leaving a failed joint generally makes the job bigger, not smaller. If you are not sure whether it needs doing, ring 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- Pictures of the joints, sent by email
- The problem you’ve noticed
- The type of property
- The rough size of the job
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we will explain what’s involved and send you a clear quote.
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Questions from Cobham
Do you cover Cobham for glazing silicone?
Yes. Our work covers London and the South East, and Cobham 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.
Will you come out to Cobham?
Yes, Cobham is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is the work guaranteed?
Our 12-month guarantee applies on all our work.
Do the sealants smell?
There can be a smell while the sealant cures. Ventilation helps.
Can I do it myself?
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.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
How long should I leave it?
Different products cure at different speeds, so follow the cure time we give you when we finish.
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The job generally takes a few hours for most jobs from start to finish. For a village or hamlet like Cobham, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First, we check where the water gets in.
- We remove the old sealant carefully.
- The joint is cleaned and degreased.
- We lay the new bead and tool it smooth.
- We check the finished joints and test with water where it’s safe.
Preparing for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know if you’ve seen damp or leaks
- Mention if the joints have been sealed before
How to get a quote
Getting a quote is simple: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Advice
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Looking after it afterwards
Looking after new joints is easy:
- Avoid strong solvents on or near the sealant
- Don’t leave a drip for the next storm
- Keep scrapers and blades away from the silicone
- Clear the conservatory gutters regularly
Look over the glazing joints every year or so. Spotting a crack early means a simpler fix.
If silicone on glass has cracked, water is already getting in. Renewing it early keeps it simple compared with fixing water damage later.
Signs you need glazing silicone in Cobham
Sealant laid over old sealant doesn’t last. Many failed joints we see have been topped up rather than cut out leaving a path for water.
Look out for any of the following:
- Leaks from the base of a shower screen
- Sealant that was laid over old silicone and failed
- Silicone pulling away from the glass
- Mouldy sealant around glass panels
In the older streets around Parish Church of St Mary Magdalene, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Before booking anyone
- What happens if the job turns out different
- The length of the guarantee
- How much experience the applicator has
- Whether the sealant suits the joint
Frames and glazing around Cobham
Historic houses like Cobham College (about 0.2 miles south-west) are a reminder that the area around Cobham has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Sole Street station? Then a shower screen or conservatory joint that leaks is easier to reseal while the property is empty. If you look after a building such as Cobham Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Cobham is about 3 miles south of Gravesend, in Kent. From the centre of Cobham to the outskirts, we cover glazing silicone for every kind of property, from flats and houses to offices and hotels. Our Kent coverage runs to 922 places, and Cobham is one of them. London is on our list too, around 23 miles away.
All of DA12 is within our area for glazing silicone, from the main roads to the quietest streets. If you need glazing silicone at a property on The Street, Lawrence Drive and Cobhambury Road or anywhere close by, we can help. Other places close to Cobham include Upper Bush (2 miles south-east), Lower Bush (2 miles south-east), Cuxton (2 miles south-east), North Halling (3 miles south-east) and Upper Halling (3 miles south). Further out, we also cover Maidstone (10 miles south-east), Sittingbourne (15 miles east), Dartford (8 miles north-west), Sevenoaks (12 miles south-west), Gravesend (3 miles north) and Tonbridge (14 miles south).
What’s near Cobham
We work in homes and buildings around Thamesview School, The Ship Inn and Jeskyns. Cobham’s nearest station is Sole Street station, about 1.2 miles south-west. Other landmarks nearby include Rochester Castle (4.3 miles east) and Gravesham Community Hospital (3.9 miles north-west). Open spaces near Cobham include Gad's Hill and Ranscombe Farm.