Portsmouth · England
Wymering Window Mastic
Window mastic in Wymering from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
- Gaps where the sill meets the wall
Window mastic for homes and businesses in Wymering
Over two decades of sealing frames has taught us which products suit which walls. We’re ARBOMaster approved and fully insured, and we give a one-year guarantee on the work. We work on composite doors, timber windows & doors and patio & French doors, and the jobs we see most are draughts coming in around windows and doors and hard, cracked sealant around windows.
Houses in smaller places like Wymering can stand more in the open than those in a built-up town. The mastic around frames on those walls tends to age faster.
All our work comes with a one-year guarantee, wherever you are in Portsmouth.
- Location
- Wymering (PO6, PO2)
- Wider area
- Portsmouth
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Can I do it myself?
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 difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
Places near Wymering
Other services in Wymering
For landlords and businesses
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. We cut it out, back any deep gaps and reseal properly.
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Around Wymering, water from a failed joint in an older home can soak into timber and plaster, and that’s a much bigger job than renewing the sealant.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Why Wymering customers choose us
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
- Neat joints and a tidy finish
- Domestic, commercial and hotel work
Take a look at our cost guide and what customers say.
When to call us in Wymering
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid cannot flex. That’s what backing rod is for.
Keep an eye out for any of the following:
- Cracked or shrunken mastic around the frame
- Untidy mastic left by window fitters
- Gaps where the sill meets the wall
- Rain getting in at the frame or under the sill
If you live in an older home near Church of St Peter and St Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- Whether all the old sealant comes out first
- What the cure time is
- What happens if the job turns out different
- How the colour is chosen
What we do, step by step
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and clear up. It generally takes anything from an hour or two to a full day, depending on how many frames there are. For a job in Wymering, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- We clear up and check every joint is fully closed.
Before we arrive
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
- Keep children and pets away from the work area
How to get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work.
Read more
Windows and doors in Wymering
Wymering is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Historic houses like Warblington Castle (about 4.8 miles east) are a reminder that the area around Wymering has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like Medina Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Rented homes near Cosham station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Wymering is about 3 miles north of Portsmouth, in Portsmouth. For window mastic in and around Wymering, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Portsmouth from our Crawley base, Wymering included. Our Portsmouth coverage runs to 19 places, and Wymering is one of them.
Work in PO6 and PO2 works the same way as everywhere else we cover. If you need window mastic at a property on Dean Road, Deal Road and Park Lane or anywhere close by, we can help. Main roads around Wymering include the A397. Close by, we work in Cosham (1 mile south-east), Paulsgrove (1 mile west), Hilsea (1 mile south), Drayton (1 mile east) and Widley (1 mile north-east). Larger places within reach include Portsmouth (3 miles south), Southsea (4 miles south), Milton (4 miles south), Landport (3 miles south), Baffins (3 miles south) and Portsea (4 miles south-west).
What’s near Wymering
Around Wymering, our work takes us to homes and buildings near Springfield School, UTC Portsmouth and Alexandra Park and the streets around them. Wymering has its own railway station: Cosham station. Nearby you will also find World War I Remembrance Centre (1.4 miles south-east) and Tricorn Centre (3.1 miles south). For a walk, there’s Portsdown Hill and Southmoor Nature Reserve.
Common questions in Wymering
Is window mastic in a coastal place like Wymering any different?
Near the sea, outside joints face more wind, rain and salt than they would inland, so preparation and the right sealant matter all the more. Walls facing the sea are generally the first to need attention.
Do you work for landlords with property near Cosham station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Is it OK to seal over old sealant?
No, because it fails. The old sealant always comes out first.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all.
Do you come to Wymering?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, and that includes Wymering.
Can I add another job to the visit?
Yes. More than one area can be quoted together.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Wymering.
Which products do you use?
Each joint gets the product that suits it. Where it moves, gets wet or faces the weather makes a difference, and we’ll explain our choice.
When it isn’t the sealant
We will not take on work that will not last, so these are the limits:
- Rotten timber, which needs a joiner first
- A door that needs adjusting, rehanging or new seals
- A sash or casement that will not close properly
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Window sills
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Composite doors
- Patio & French doors