Southampton · England
Remedial sealant & repairs in St Mary's, Southampton
Our applicators work in St Mary's on removing failed, mouldy or leaking sealant and putting it right. Old sealant removed completely, joints prepared properly.
- Smears and lumps from a botched reseal
- Gaps opening along the back of the worktop
- Over-sealed joints coming away
Remedial sealant in St Mary's
Water on the floor does not always mean failed silicone. 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. If you’re dealing with leaks that keep coming back after resealing and smears and lumps from a botched reseal, we can help, whatever the surface.
In and around St Mary's, older properties sit alongside newer ones. Older homes can move a little with the seasons, which is hard on tired sealant and rigid grout.
All of our work is guaranteed for twelve months.
- Place
- St Mary's (SO14, SO15, SO18)
- Region
- Southampton
- Cover
- One year on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Landlords, agents and businesses in St Mary's
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 that we can handle for you.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Nearby places to St Mary's
Other services in St Mary's
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Run the fan after every shower
- Never fill a movement joint with mortar or grout
- Check trays and worktops do not move
- Clean sealant with mild products only
If the joint ever needs renewing, have it cut out, not sealed over. New silicone does not bond to old, so the old bead should always come out first.
A split movement joint lets rain into walls and floors, and left long enough, the edges of the joint can crumble. Resealing while the edges are sound is simpler.
Your questions about remedial sealant in St Mary's
Can you help a landlord with a rental near Southampton Central station?
Yes, we work for landlords and agents. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Do you work for hotels and guest houses in St Mary's?
Yes. Hotel and guest-house work is part of what we do. Work can be planned room by room, and out-of-hours working can be arranged.
Do you come to St Mary's?
Yes. We cover St Mary's and the rest of Southampton. To book, ring 0345 464 0079 or send us an email.
Someone resealed my shower and it’s leaking again. Can you help?
Yes. We check it’s the sealant and not the tray, valve or waste, then strip and reseal the joints.
Where do you work from?
Mr Mastic is based in Crawley. We cover St Mary's and the rest of Southampton.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Do you have insurance?
Yes. We are fully insured, and we’ve been doing sealant work for more than 20 years.
Can you strip sealant from an acrylic tray safely?
Yes. Residue is removed with a product suited to the surface rather than scraped hard.
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
What remedial sealant looks like in St Mary's
St Mary's is within about 1 mile of 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. There are hotels and other places to stay in and around St Mary's. Hotel bathrooms are part of our work as well as homes, and can be done room by room.
Rented homes near Southampton Central station change hands often, and botched sealant from a previous quick fix is easier to strip out between tenants. Homes close to St Mary's Church include some older properties, and older homes can move a little, which is hard on rigid grout and tired sealant. For site and facilities teams at buildings such as Hope Community School Southampton, its toilets, changing areas and kitchens need their sealant renewed like any other building’s.
St Mary's is about 1 mile south of Southampton, in Southampton. We provide remedial sealant to homeowners, landlords and businesses in St Mary's and nearby, as part of our work across Southampton. Across Southampton, we cover 40 places, and St Mary's is one of them.
Our applicators cover all of the SO14, SO15 and SO18 postcode area for remedial sealant and the streets around it. If you need remedial sealant at a property on New Road, Ogle Road and Marsh Lane or a nearby road, our applicators can take on the job. We also cover the places around St Mary's: Northam (1 mile north-east), Inner Avenue (1 mile north), Peartree Green (1 mile east), Southampton (1 mile north) and Bitterne Manor (1 mile north-east). Larger places within reach include Chartwell Green (3 miles north-east), Harefield (3 miles east), Maybush (3 miles north-west), Coxford (3 miles north-west), Lordswood (3 miles north-west) and Eling (4 miles west).
Near you in St Mary's
Locally, jobs take us to homes and businesses close to The Joiners pub, Woolston School and Houndwell Park and the streets around them. The closest station to St Mary's is Southampton Central station, about 0.8 miles west of the centre. Other landmarks nearby include Netley Castle (2.5 miles south-east) and Bargate Guildhall Museum (under half a mile south-west). Not far away are Netley Common.
How the job changes by surface
Over-sealed & botched joints
Every layer has to come out, including the smears and film on surrounding tiles. New sealant needs a fully clean surface.
Windows & doors
Failed frame mastic is often hard, cracked and in several layers. All of it is cut out and the frame and wall cleaned.
Quotes for remedial sealant in St Mary's
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- The amount of work
- Working hours on commercial sites
- How easy the joints are to reach
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Roughly how big the job is
- The problem you’ve noticed
- The type of property
- If someone has resealed it before
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
What we do, step by step
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. Most jobs then take a few hours for most joints, depending on how much old sealant has to come out. For a job in St Mary's, 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 protect the surfaces around the joint.
- The botched or failed sealant is cut away completely.
- The joint is degreased and checked for movement and leaks.
- New sealant goes in once the joint is dry, and is tooled smooth.
- We give you the cure time and explain what caused the failure.
Getting ready for the visit
- Clear items away from the joints we’re working on
- Try not to wet indoor joints just before the visit
- Mention any tricky access
Getting a quote
If you’re in St Mary's and need remedial sealant, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you’ll get a clear quote before we start.
Related advice
When something else is needed
We will always be straight with you, so here’s what new sealant won’t do:
- Older mastics that may need an asbestos check before removal
- A bath, tray or worktop that moves until it’s properly fixed
- Tiles that have come away from the wall
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
Joints and surfaces we work on
- Leaking tray & enclosure joints
- Shrunken worktop sealant
- Botched or over-sealed joints
- Expansion joints
- Failed movement joints
- Mouldy bath & shower sealant