New window film often needs time before it reaches its final appearance. Light haze, soft water pockets and a slightly uneven look can be normal after installation. These effects settle as the mounting solution evaporates and the adhesive develops its full bond with the glass.
The curing period depends mainly on the film thickness and drying conditions. Standard films may take around 30 days, while thicker safety and security films can take several months. Until the applicable curing period has passed, moisture and haze should not be treated as installation faults.
Quick guide to what you may see
| What you see | What it usually means | What to do |
|---|---|---|
| Soft or cloudy water pocket | Normal curing moisture | Leave it alone and allow the film to dry |
| Light haze or milkiness | Normal during curing | Monitor it as the appearance gradually clears |
| Tiny fixed particle | Possible inclusion | Assess it after curing from the WFAANZ inspection distance |
| Hard edged bubble or crease | Possible installation issue | Contact the installer |
| Film lifting at an edge | Not part of normal curing | Contact the installer promptly |
Why film needs time to cure
Architectural window film is installed with a water based mounting solution. This allows the installer to position the film accurately before using a squeegee to remove most of the water and air.
Some moisture remains between the film and glass while the adhesive strengthens. Panes can clear at different rates, with warm, sun exposed glass usually drying faster than cold, humid or shaded glass.
How long curing can take
The WFAANZ Visual Quality Standard gives the following typical curing periods. Cold, humid and shaded conditions can extend them.
| Film thickness | Typical curing period |
|---|---|
| Less than 100 microns | 30 days |
| 100 to less than 200 microns | 60 days |
| 200 to less than 300 microns | 100 days |
| 300 microns or thicker | 140 days |
The product specification determines the film thickness. Thicker safety and security films generally take longer to cure than standard solar control or decorative films. Your installer can confirm the period that applies to the film installed on your glass.
What is normal during curing
The following can be normal while the film dries:
- Small, soft water pockets beneath the film
- Light haze or a slightly milky appearance
- Patchy areas that clear at different rates
- Minor optical variation when the glass is viewed from an angle
- A few small points that reflect light
These effects should gradually become less noticeable. Do not press, puncture or push water pockets toward the edge. Doing so can damage the film or disturb the adhesive.
The difference between moisture and an air bubble
A curing moisture pocket usually looks soft or cloudy and changes as it dries. An air bubble tends to have a sharper outline and remains raised from the glass. Contact the installer if you see a hard edged bubble, crease or dry raised area.
When to assess the finished installation
Allow the applicable curing period before making a final assessment of haze or water pockets. Once the film has cured, its visual quality should be considered under the WFAANZ standard rather than by examining the glass from a few centimetres away.
The standard applies to the installed film. It does not turn existing marks, scratches or defects in the glass into film defects.
How the WFAANZ inspection is carried out
Each pane is inspected:
- From inside the building
- Perpendicular to the centre of the window
- Against a clear or completely overcast sky
- Without direct sunlight on the glass
- Separately and for no more than 30 seconds
How inclusions are assessed
An inclusion is a small particle trapped between the film and glass. It stays in the same position, unlike curing moisture, which changes and clears over time.
A small number of inclusions can be expected even with a professional installation because architectural film is applied on site rather than in a controlled factory environment. Their presence does not automatically mean the installation is defective.
Under the WFAANZ standard, an inclusion in the normal viewing area is not acceptable when it is visible from the applicable inspection distance. Small inclusions outside the part of the pane through which a person would normally look may be acceptable, with allowances depending on the frame type and film thickness.
| Frame type | Inspection distance | Maximum inclusions per square metre |
|---|---|---|
| Aluminium or uPVC | 3 metres | 5 |
| Wood | 3.5 metres | 20 |
The inclusion limits apply per square metre of the total glass area of each pane. A 50 mm band around the perimeter has separate allowances where the frame or seal makes a completely clear installation difficult.
Edge gaps and film joins
Some visible details are necessary parts of a professional installation.
Edge gaps
Film is trimmed slightly inside the frame so the mounting solution can be removed and the film does not press against the gasket or seal. WFAANZ permits a perimeter gap of up to 4 mm on clean windows. Safety or security film that is 200 microns or thicker may have a gap of up to 5 mm.
A larger gap may be reasonable around irregular putty, paint or damaged frame edges, provided it has been finished skilfully.
Film joins
A join may be necessary where both dimensions of the glass exceed the available film width. A required join is not an installation defect. A splice or butt join should have a gap no wider than 0.5 mm. An overlap join should generally be even and between 2 and 5 mm wide.
External film and difficult site conditions
The standard installation assumptions include clean, defect free glass, an internal installation, safe ground level access, at least one metre of clear working space, a pane no larger than 2.5 square metres and no other building work nearby.
Exterior film is exposed to wind and airborne contamination, so more inclusions may be present than on an internal installation. Old timber, deteriorating putty, silicone, paint, construction dust and simultaneous building work can also affect the result.
When to contact the installer
Contact us promptly if the film is lifting or peeling, or if you see a hard edged air bubble, crease, cut, scratch or other physical damage.
Contact us after the curing period if moisture or haze remains, or if significant contamination is visible from the applicable WFAANZ inspection distance.
Looking after film while it cures
- Do not press or puncture water pockets.
- Keep painters, cleaners and other trades from scraping or taping the filmed surface.
- Wait at least 30 days before cleaning the filmed side, or follow the longer period advised for the particular film.
- After the waiting period, use a soft microfibre cloth and a mild film safe cleaner.
- Contact the installer before attempting to repair or remove anything.
For ongoing care, see our window film cleaning guide. If a concern appears after curing, our window film warranty guide explains what the product warranty covers and how an installer can help. Our customer guides bring together practical advice for each stage of your project.
Frequently asked questions
How long does window film take to cure?
Allow 30 to 140 days, depending on film thickness. Cold, humid and shaded conditions can extend the process.
Are bubbles normal after installation?
Soft water pockets can be normal while the film cures. Report a hard edged air bubble, crease or dry raised area.
Are inclusions normal after window film installation?
A small number of inclusions can occur even with a professional installation. They are assessed after curing under the WFAANZ viewing conditions and from the applicable inspection distance.
How far away should window film be inspected?
Inspect from 3 metres for aluminium or uPVC frames and 3.5 metres for wooden frames, using the WFAANZ viewing conditions described above.
Need help with recently installed film?
If UV Window Coatings installed your film and you are unsure about its appearance, send us photographs of the complete pane and the area concerned. We can identify normal curing, assess the finished film against the WFAANZ standard and arrange an inspection where necessary.
Read the current WFAANZ Architectural Window Film Visual Quality Standard, or learn more about residential window tinting in Melbourne and commercial window tinting.
Want window film for your home, apartment or workplace? Explore residential window tinting, apartment window tinting or commercial window tinting, or book a free assessment.
Topics in this article