Marine Glass Restoration · Denmark, Norway and Sweden
Restore ship windows instead of replacing them
WILLFLO removes scratches, salt and limescale deposits and stains from ship windows – on board while the vessel is in port, or during a yard stay. We assess the glass first and tell you honestly whether it can be restored.
- Free assessment
- 16 years of experience with glass
- Our own warranty on the polishing
- Every job documented with photos and video
Clients
References
Vessels we have worked on
From tugs at the shipyard to passenger ferries in port. A selection of recent projects:
Tug · Assens Skibsværft
Svitzer Mjølner
28 wheelhouse windows with about 15 years of mineral deposits, sea salt and chemical residues – restored in about four days in dock II (April 2024) and protected with a 2-year glass coating.
Fast ferry · Fjord Line
Fjord FSTR
54 windows with mineral deposits, limescale and paint residues, polished from a 35 m lift at Munkebo (March 2026) and protected with 2-year and 5-year glass coatings.
Cruise ferry · Fjord Line
MS Stavangerfjord
24 bay windows of the top-category cabins with mineral deposits and paint residues, polished from a lift in the port of Hirtshals in one day (May 2026).
Passenger vessel
Nordic Crown
A test window polished from a lift alongside the vessel and protected with a glass coating. More windows are planned for the next dock stay.
Trawler · Karstensens Skibsværft, Skagen
Myggenes
About 30 windows scratched when the protective film was removed after the new build – ground and polished inside and out in February 2025.
Trawler · Karstensens Skibsværft, Skagen
Håkon
About 46 windows scratched during the new build – ground and polished inside and out in 14 days and finished with a protective glass coating. April 2025.
What the shipyard says
»WillFlo har arbejdet for Karstensens Skibsværft på forskellige skibe, og det har været et fantastisk arbejde de har formået.«
Brian Guldhammer, Personnel/Operations Manager, Karstensens Skibsværft · LinkedIn recommendation, september 2025
“WillFlo has worked for Karstensens Skibsværft on various vessels, and the work they have done has been fantastic.”
We have also restored glass on other trawlers and on excursion ferries.
Our own work
Before and after
Svitzer Mjølner. Wheelhouse window with salt and limescale deposits.
Fjord FSTR. Panoramic window, matt and stained before polishing.
MS Stavangerfjord. Cabin window with mineral deposits and paint residues.
Nordic Crown. Test window before and after polishing.
Watch the glass clear up
Polishing a wheelhouse window on Svitzer Mjølner, filmed from the inside. The polished area becomes clear while the rest of the pane is still hazy. Shown at triple speed.
All photos and videos on this page are from our own jobs.
On site
See the work
Case · Trawler · February 2025
Myggenes: scratches inside and out
The windows on the new trawler Myggenes were protected with film during the build. When the film was removed incorrectly, it left scratches on both the inside and the outside of the glass. In February 2025 we ground and polished about 30 windows at Karstensens Skibsværft in Skagen – about 10–12 days of work.
All photos and videos are from the job.
Case · Trawler · April 2025
Håkon: scratches inside and out
Like Myggenes, the new trawler Håkon ÞH-250 had windows scratched inside and outside when the protective film from the build was removed incorrectly. In April 2025, in the port of Skagen, we ground and polished about 46 windows over 14 days and finished all windows with a protective glass coating.
All photos and videos are from the job.
Honest assessment
When restoration works – and when replacement is necessary
Can typically be restored
- Surface scratches, including wiper and cleaning marks
- Salt and limescale deposits
- Stains, haze and water spots
- Scratches and marks from refit and yard work
Needs assessment or cannot be restored
- Deep scratches closer than approx. 7–8 cm to the frame cannot always be removed without risk of optical distortion
- Welding spatter can sometimes be removed, but the result depends on how deep the pits are – we rarely recommend it
- Cracks and other structural damage – the glass must be replaced
- Plexiglass and acrylic – we only work with glass
Can you feel the scratch with a fingernail? Fine scratches that cannot be felt are polished with cerium oxide. Deeper scratches are ground first with Mirka Abranet and Abralon abrasives, then polished back to full clarity with cerium oxide.
The process
How a marine glass job works
- Photos. Send photos of the damaged windows. The assessment is free.
- Assessment. We identify the type and depth of the damage and tell you whether restoration is possible.
- Planning. We agree on time and access – on board while the vessel is in port, or during a yard stay.
- Masking. Frames, seals and surroundings are protected with tape and film.
- Grinding and polishing. Fine scratches are polished with cerium oxide. Deeper scratches are first ground out with Mirka Abranet and Abralon – the glass turns milky and matt – and then polished back to full clarity with cerium oxide.
- Inspection and documentation. The result is checked with light and on video for optical distortion, and documented with photos and video before and after.
Optional: glass coating. After polishing, the glass can be given a protective nanocoating that makes it easier to keep clean.
Recommendation
What our clients say
»I forbindelse med et dokophold på en af Fjord Lines færger har vi gjort brug af virksomheden WillFlo til polering og coating af skibets vinduer. Arbejdet blev udført med et særdeles tilfredsstillende resultat. WillFlo demonstrerede høj faglighed og en grundig tilgang til opgaven, hvor selv stærkt belastede og vejrpåvirkede glasoverflader blev restaureret til en markant forbedret optisk klarhed. […] På baggrund af ovenstående kan vi give WillFlo vores klare anbefaling til lignende opgaver inden for polering og overfladebehandling af marineglas.«
Christian Meyer Poulsen, Senior Technical Superintendent · LinkedIn recommendation, marts 2026
“During a dock stay of one of Fjord Line’s ferries, we used WillFlo to polish and coat the ship’s windows. The work was carried out with a highly satisfactory result. WillFlo showed a high level of expertise and a thorough approach, restoring even heavily worn and weathered glass surfaces to a markedly improved optical clarity. […] We can give WillFlo our clear recommendation for similar work within polishing and surface treatment of marine glass.”
FAQ
Questions from shipyards and vessel operators
Can scratched ship windows be restored?
Often, yes. Surface scratches, deposits and stains can usually be polished away. Whether it is possible depends on the depth and position of the damage, so we always assess the glass first.
Can the glass be polished on board?
Yes. We work on board while the vessel is in port, or at the shipyard during a yard stay.
Where do you work?
We work in Denmark, Norway and Sweden.
When is replacement necessary?
When the glass is cracked or has other structural damage, when deep scratches sit too close to the frame, or when the window is made of plexiglass or acrylic.
Can the glass be protected afterwards?
Yes. After polishing we can apply a glass coating that makes the surface easier to keep clean.
What information do you need from us?
Photos of the damage, the vessel name and type, the port or shipyard, the number of windows and your preferred timeframe.
Warranty
Our warranty
We give our own warranty on the polishing. After the job there is:
- no optical distortion
- no visible matt areas
- no scratches
Contact
Discuss a marine project
Send photos of the damaged windows together with the vessel name, port or shipyard and the number of windows. We will assess whether the glass can be restored – free of charge.
We reply within 24 hours.
Or call +45 52 67 33 90 · Monday–Friday 8.00–17.00 (CET) · kontakt@willflo.dk