The Mastic Doctor team standing beside their branded vans outside an office building
Southampton · England

Portswood coloured sealant

Coloured and colour-matched sealant for visible joints in Portswood and across Southampton. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.

  • Weathered sealant that no longer matches
  • Dirty, discoloured joints in public areas
  • Fit-outs with a sealant colour in the specification
1
Send details
Drawings, photos, a joint schedule or a site visit.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Prepared joints, the specified product, a tidy finish.
4
Guaranteed
Signed off, with 12 months’ guarantee.
London, the South East & Scotland
Constructionline member
Fully insured: £5m PL

Need coloured sealant in Portswood?

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Our process

Inspect, seal, sign off: every visit follows that pattern. We inspect the joints and confirm what’s in scope, then the work is carried out to the specified product and detail, and the job ends with a walk round and sign-off. Several jobs near Portswood can be grouped on one trip. Tell us your site hours and we’ll plan around them.

  1. Photos or drawings show us the finishes and joints.
  2. We send the closest colours from the product’s range.
  3. The programme and access are agreed, including any phasing.
  4. We prepare each joint, prime where needed and fit backing.
  5. We seal in the approved colour and tool it smooth.

Before we start on site

  • Make sure the joints can be reached
  • Confirm the product named in the specification
  • Tell us your opening times and when work is allowed

Getting a fixed quote

Every job follows the same four steps: send details, get a quote, we seal, guaranteed. The first step is to give us a call on 01277 525 020 or email drawings and photos with what you know.

Get a price

Related advice

Coloured sealant in Portswood

Colour-matched joints are often among the last items before handover. We work around other trades and protect adjacent finishes, and snag any marks before we leave. Our workmanship carries a 12-month guarantee. If you’re dealing with sealant that no longer suits recoated frames and standard-colour sealant spoiling a high-end finish, we can put it right, on shop-fit joinery and counters, powder-coated and anodised frames and hotel bathrooms and public areas alike. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: in Portswood, that means joint design, primers and backing rod as standard.

Small businesses near places like Portswood frequently occupy converted farm buildings. Those conversions put new frames and partitions against old brick, stone or timber, so each joint needs a product chosen for both surfaces.

Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If our installation lets you down in that time, we return and fix it.

Where
Portswood (SO17, SO14, SO18)
Wider area
Southampton
Guarantee
12 months on our workmanship
Quote
Fixed quote, scope in writing
Call
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Honest limits

Part of a good diagnosis is knowing where sealant stops. You’ll hear from us if the cause turns out to be one of these:

  • Colour variation across natural stone or brick that no single shade can match
  • Overpainting a joint that needs a non-paintable product
  • Custom-mixed sealant colours

If in doubt, call the office on 01277 525 020 or send photos by email and we’ll say what we think before you book.

Joints and surfaces we work on

  • Office fit-out finishes
  • Hotel bathrooms and public areas
  • Shop-fit joinery and counters
  • Powder-coated and anodised frames
  • Cladding panels
  • Natural stone and brick

Surface by surface

Brick and masonry

On brick, the sealant often matches the mortar rather than the brick face. The nearest colour in the range is agreed with you before work starts.

Cladding panels

Cladding joints are often seen across a whole elevation. The colour is picked from the range of a sealant that suits the panel joint.

Sealant on show in Portswood’s commercial buildings

With the shore within about 2 miles, Portswood counts as a coastal location. Buildings near the sea put their external joints through more driven rain, with salt air nearer the beach. Where a frontage needs a particular colour, the product still has to suit that exposure. Plenty of hotels sit less than 2 miles from Portswood. Hotel refurbishments are where a matched sealant colour earns its place: bathroom, bar and reception joints have to sit with the finishes, with rooms done in turn while the rest stay let.

If you run an office at a site such as Itchen Business Park (0.5 miles north-east of Portswood), the sealant at reception desks, tea points and frames ages with each fit-out. For a hotel such as Highfield House Hotel, under half a mile north-east of Portswood, the colour of a joint at the bar or the bath matters to the look of the room.

Portswood is about 1 mile north of Southampton, in Southampton. Anywhere in SO17, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. We work across 30 places in Southampton, from busy centres to rural villages.

Anyone looking for coloured sealant in SO17, SO14 and SO18 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. Streets here include Ivy Road, Alma Road and Lawn Road, and sites on any of them can send details for a fixed quote. With the A335 and A3035 nearby, Portswood is straightforward for us to reach. If your building is just outside Portswood, we cover St Denys (1 mile south-east), Southampton (1 mile south), Inner Avenue (1 mile south-west), Bitterne Manor (1 mile south-east) and Bitterne Park (1 mile east). Nearby towns on our patch include Thornhill (3 miles south-east), Maybush (3 miles west), Millbrook (3 miles west), Weston (3 miles south) and Redbridge (4 miles west). Among the larger centres in Southampton is Portswood, and its commercial and public buildings are all within our area.

What’s near Portswood

In Portswood, that means premises near St Anne's Catholic School, St Mary's Independent School and South Western Arms and the streets around them. There’s a railway station in Portswood itself: St Denys station. Other landmarks nearby include Marlands Shopping Centre (1.5 miles south) and Royal South Hants Hospital (0.9 miles south). Green spaces nearby include Netley Common.

Map of Portswood © OpenStreetMap contributors

Common problems we fix in Portswood

When frames are recoated or a space is rebranded, the old joints may no longer suit. New cladding colours, repainted frames or a refreshed shop fit all prompt colour changes.

Typical triggers for a call:

  • Previous reseals that don’t match the original
  • Failed coloured sealant that has split or peeled
  • Fit-outs with a sealant colour in the specification
  • Weathered sealant that no longer matches

For premises near St Denys station, under half a mile to the south-east of Portswood, footfall is part of the plan: work is phased so shops and offices keep trading.

Questions to ask before you book

  • How joint depth will be controlled
  • Do they follow the manufacturer’s priming guidance?
  • Their pre-qualification and accreditations
  • Who will actually carry out the work

Our contractor checklist

Aftercare for building managers

Once the work is signed off, these steps help:

  • Insist on the agreed colour for any repair
  • Keep harsh solvents away from visible joints
  • Plan full-run reseals on visible elevations
  • Keep the area clear while the sealant cures

Let the joints cure as the manufacturer advises before they’re cleaned. Coloured sealant marks more visibly than white while it is fresh, so keep the area clear.

Make sure every contractor knows which sealant and colour are on the building file. That keeps new work in line with what’s there.

Portswood: questions and answers

Will our hotel in Portswood need to close for the work?

Rarely. Rooms or floors are done in turn, so the rest of the hotel keeps trading. The plan is built around your bookings.

Our building in Portswood is near the coast: does that change the sealant?

It can. Coastal exposure works external joints harder than inland weather. We check the specified product suits the exposure and pay close attention to preparation.

Do you match sealant to RAL colours?

Yes. Give us the RAL reference and we will check it against the product’s range. You will see the nearest options at quote stage.

Can you follow the specification on our project?

Yes. The specification and the manufacturer’s installation guidance are what we work to, and any queries are raised before we start.

How long will the new sealant last?

Nobody can honestly give a figure in years, since movement, weather, cleaning and use all affect it. Regular inspection is the best way to catch problems early.

Does weather matter for sealant work?

For external joints, yes. Sealant needs a dry joint and a temperature within the product’s range, so frost, rain or cold mornings can delay outside work. Internal work is rarely affected.

Will you quote for a small job?

Whatever the size, the process is the same: send details, get a fixed quote, we seal, guaranteed.

Why deal with it now?

Agreeing the colour before work starts avoids paying twice. A sample takes little time compared with replacing joints in the wrong colour. A failed joint lets water into a building whatever its size. Catching it early means a reseal rather than repairs.

No two sites price the same: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.

Why us?

  • 12 months’ guarantee on every job
  • Commercial sealant work since 2005
  • RAL and finish matching where the product range allows
  • Our applicators hold CSCS cards

See how commercial sealant jobs are priced and how we’re accredited.

Accreditations

Trusted. Accredited. Insured.