Portsmouth · England
Bathroom Resealing in Cosham
Bath, shower, basin, wet room, worktop and sink resealing in Cosham, with a 12-month guarantee on every job. Call for a quick quote.
- Smears of silicone across the tiles
- Gaps between the worktop and the wall
- Water getting behind the bath panel
About our bathroom resealing in Cosham
We fill the bath before sealing it. The weight settles the bath to its lowest point, so the bead is not stretched the first time someone gets in. It’s a small step that rushed reseals tend to skip. We are often asked to deal with mouldy sealant that has gone black and damp behind the bath or under the tray, across wet rooms, kitchen worktops & upstands and sinks & splashbacks.
Even in a smaller place like Cosham, bathrooms and kitchens see heavy daily use. Whether it’s a cottage bathroom or a newer en suite, the approach is the same: all the old material out, the joint cleaned and dried, then new sealant or grout.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Location
- Cosham (PO6, PO3, PO2)
- Wider area
- Portsmouth
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Sinks & splashbacks
Next to the sink, the sealant has to cope with constant water, including a food-safe sealant where that’s needed. The bead is finished smooth so it wipes clean.
Basins & vanity units
The back of a basin gets wet every time someone washes. Corners behind basins are where mould tends to start, and we treat it exactly as we would a bath.
What happens on the day
Before we leave, we go over the finished joints with you. The visit itself generally takes half a day or less for one room, longer when the kitchen is included, depending on the size of the job. Parking around Cosham is normally easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- We cover the area around the joints we’re working on.
- We cut away the old sealant and clean off what’s left.
- Mould is treated, then the joint is left to dry thoroughly.
- Any bath is filled with water, then we lay a bead of anti-fungal silicone in white, clear or a matching colour.
- We finish the joint, clear up and tell you how long to leave it before it gets wet.
How to prepare
- Clear items away from the joints we are working on
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
Get a quote
For bathroom resealing in Cosham, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before we start.
Related advice
Cosham: your questions answered
Can you do bathroom resealing in Cosham?
Yes, Cosham is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Cosham station?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or drop us an email and tell us about the property, and we’ll give you a clear quote.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Where is Mr Mastic based?
Our base is in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you do kitchens as well as bathrooms?
Yes. Next to the sink we use a food-safe product where it’s needed.
Can I do it myself?
Sometimes. 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.
What should I tell you?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply call 0345 464 0079 or send us an email.
Can new silicone go straight over the old?
No, and it’s one of the main reasons reseals fail. The old joint is stripped, cleaned and resealed from scratch.
Common problems we fix in Cosham
Baths and trays move. Acrylic in particular gives slightly under the weight of water and a person, and a tray that isn’t fully bedded can rock. That movement works at the bead until it splits or peels away.
The most common problems we see are:
- A bead that has pulled away from the tiles
- A messy, uneven bead from a previous reseal
- Water escaping at the shower enclosure
- Mouldy sealant that has gone black
If you live in an older home near Church of St Philip, walls and floors in older homes can move, and sealant and grout show it first.
What to look for in a quote
- What the cure time is
- Whether all the old sealant comes out first
- What product goes in the joint
- What happens if the job turns out different
Bathrooms and kitchens in Cosham
Cosham is within about 1 mile of the coast. Near the coast, holiday lets and guest houses can see bathrooms used by one guest after another, and sealant and grout that work that hard wear out sooner. Most of the South East has hard water, so limescale builds up on sealant, grout and fittings.
For landlords with property near Cosham station, fresh sealant around the bath, shower and sink between tenancies helps a property present well and keeps leaks at bay. Managing a site like Court Lane Junior Academy? Then 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.
Cosham is about 2 miles south-west of Purbrook, in Portsmouth. Every kind of property in Cosham is covered for bathroom resealing, old or new, large or small. Every job comes with our 12-month guarantee. 19 places in Portsmouth are on our list, large and small.
Work in PO6, PO3 and PO2 is quoted and booked the same way as anywhere else. Local streets include Dean Road, Park Lane and Elgin Road, all of which we cover. Cosham is on the A397, which makes it straightforward to reach. We also cover the places around Cosham: Wymering (1 mile north-west), Hilsea (1 mile south), Drayton (1 mile east), Widley (1 mile north-east) and Paulsgrove (1 mile west). Further out, we also cover Southsea (4 miles south), Milton (3 miles south), Landport (3 miles south), Portsea (3 miles south-west), Portsmouth Point (4 miles south-west) and Fratton (3 miles south).
Around Cosham
In Cosham, that means homes and buildings near The First Post pub, Alexandra Park and Springfield School and the streets around them. Cosham has its own railway station: Cosham station. A little further out are Tricorn Centre (2.9 miles south) and World War I Remembrance Centre (1 mile south-east). Open spaces near Cosham include Southmoor Nature Reserve and Portsdown Hill.
Work for landlords, hotels and businesses
If you manage several properties in or around Cosham, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
We also work for property managers and facilities teams. Several sites can be quoted together.
What sealant work cannot fix
Sealant is not the answer to every problem, and we’d rather say so up front. It won’t solve:
- A bath or tray that moves because it is not properly supported
- Water getting in through the grout rather than the sealant
- Leaks from a shower valve, waste or pipework (a plumber’s job)
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Where we work in Cosham
- Shower trays & enclosures
- Basins & vanity units
- Sinks & splashbacks
- Baths
- Kitchen worktops & upstands
- Wet rooms
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Give the silicone its full cure time
- Avoid abrasive pads on the sealant
- Keep the fan on for a while after bathing
- Keep bottles off the sealant line
Clean the silicone with care: warm soapy water and a soft cloth do the job. Scourers and blades can nick the surface, and a nicked bead lets mould in sooner.
Watch for the early signs: lifting ends, gaps, dark shadows under the bead or a stain downstairs. Any of these means the joint needs attention.
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.