West Sussex · England
Glazing & conservatory sealant in Crosspost, West Sussex
Glazing silicone for Crosspost, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Stained, discoloured glazing silicone
- Failed joints on frameless glass
- Split or lifting silicone on glass
When to call us in Crosspost
Sunlight breaks sealant down, especially on conservatory roofs. It goes brittle, cracks and stops sticking on the glass.
People normally contact us after spotting something like this:
- Water escaping where a screen meets the wall
- Drips on the inside of a conservatory window
- Split or lifting silicone on glass
- Water getting into a conservatory at the joints
If you look after a building such as Bolney CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s.
Questions to ask before booking
- What insurance they hold
- Who turns up on the day
- What preparation is included
- What guarantee comes with the work
Glazing silicone in Crosspost
We do not replace glass, and misting between panes means a failed sealed unit. Our work is the sealant joints, which is where many leaks start. We work on glass-to-glass joints, conservatory frames and shower screens, and common reasons people get in touch are shower screens leaking along the wall or tray and a quick top-up bead that didn’t last.
Around Crosspost, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Your job is guaranteed for a year, as with all our work.
- Place
- Crosspost (RH17)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Nearby places to Crosspost
Also in Crosspost
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Squeegee the shower screen after each use
- Keep air moving in the conservatory
- Do not use a blade near the sealant
- Stick to mild cleaners on glass
On shower screens, wipe or squeegee after use and let the room air. It helps stop mould getting into the silicone.
A small conservatory leak soon spreads. Water runs along frames and down walls so it’s best dealt with right away.
Why it’s worth doing now in Crosspost
Topping up old silicone can look like a fix, but silicone doesn’t stick to silicone, and the leak normally returns. A proper reseal is the lasting answer. Around Crosspost, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear price for the lot.
Why choose Mr Mastic in Crosspost
- One-year guarantee on every job
- We’re fully insured
- Anti-fungal silicone where joints get wet
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide and our reviews.
Common questions in Crosspost
Do you cover smaller places like Crosspost?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Do you work for landlords with property near Wivelsfield station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear price.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Do you offer different sealant colours?
We help you choose a colour that suits. The choice depends on the product the joint needs.
Is it worth trying it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you reseal glass shower screens?
Yes, it’s a common job. The screen is resealed with anti-fungal silicone made for wet areas.
Do you fit new glass or sealed units?
We do not replace glass. We look after the sealant joints and can tell you if a unit seems to have gone.
Why not top up the existing silicone?
Silicone doesn’t stick to silicone, so a top-up soon lets water through. The old bead always comes out first.
What the job involves on each surface
Shower screens
A screen’s wall joint and tray joint are where leaks start. We reseal both with anti-fungal silicone.
Glass balustrade bases
Balustrade bases are exposed outdoors. A sound sealant joint keeps them tidy and dry.
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Misting between the panes of a double-glazed unit (a failed unit for a glazier)
- Rotten or badly damaged frames
- Glass that needs replacing
If in doubt, call 0345 464 0079 or drop us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Glass-to-frame joints
- Shower screens
- Conservatory frames
- Glass-to-glass joints
- Glass balustrade bases
- Rooflights
Frames and glazing around Crosspost
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Ockenden Manor (about 3.1 miles north-east) nearby, there’s older building stock in the area around Crosspost as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For landlords with property near Wivelsfield station, a shower screen or conservatory joint that leaks is easier to reseal while the property is empty. If you live in an older home near St Mary Magdalene's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Crosspost is about 4 miles north-west of Burgess Hill, in West Sussex. Anywhere in RH17, we can carry out glazing silicone at your property. 371 places in West Sussex are on our list. There’s also a page for Crawley, about 9 miles away.
Every address in RH17 is covered for glazing silicone. If you need glazing silicone at a property on Cowfold Road and Chapel Road or anywhere close by, our applicators can take on the job. We also cover Bolney (1 mile north-east), Twineham Green (1 mile south), Twineham (2 miles south), Wineham (2 miles south-west) and Kent Street (2 miles west). Within a short drive, we also cover Crawley (9 miles north), Horsham (7 miles north-west), Worthing (14 miles south-west), Haywards Heath (5 miles east), Burgess Hill (4 miles south-east) and East Grinstead (13 miles north-east).
Near you in Crosspost
Crosspost’s nearest station is Wivelsfield station, about 4.2 miles east. Well-known places in the area include The Dene Hospital (2.5 miles south-east) and Cuckfield Museum (3.2 miles north-east). Not far away are Blunts Wood and Paiges Meadow.
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
The process
You don’t need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a few hours, depending on how many joints need doing for a typical job. Somewhere like Crosspost needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We trace the leak and confirm it’s a sealant joint.
- We remove the old sealant carefully.
- We clean the glass and frame so the new silicone bonds.
- A neutral-cure glazing silicone is applied and tooled.
- We check the finished joints and test with water where it’s safe.
Getting ready for the visit
- Mention any leaks or damp you’ve noticed
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add photos by email if you can.