Measure the usable pane, not just the opening

Measure the clear glass width and height at more than one point, especially on older shopfronts where frames may not be perfectly square. Record the distance to mullions, door handles, locks, hinges and existing safety markings. A design centred on the architectural opening can look off-centre when the actual visible glass is interrupted by a frame. Mark the intended viewing height from the floor and consider whether people approach the window from the left, right or directly ahead. For a full-pane graphic, ask the installer what edge clearance is required for the specific film and installation method rather than assuming a universal gap. Use one annotated photograph per pane, with dimensions and orientation, so the artwork team does not have to guess which window is which.

First surface and second surface are not interchangeable

First-surface application places the graphic on the viewer-facing side of the glass. Second-surface application places it on the opposite side so the viewer sees it through the pane. For a storefront viewed from outside, an inside-mounted graphic may need reverse printing or an appropriate film construction so the design reads correctly through the glass.

Transparent and opaque films behave differently, and some inks or white layers are needed to control visibility against the interior background. An inside application may be protected from weather but still affected by interior cleaning and reflections. An outside application is easier to view directly but faces weathering and public contact. Film suppliers such as 3M specify suitable first- or second-surface uses for particular products; do not assume any sticker can be flipped to either side.

Decide how much glass should remain transparent

A solid opaque decal creates strong colour and privacy but blocks the view through that part of the window. A translucent or frosted treatment allows light through while softening visibility, though it does not reproduce every colour like an opaque printed graphic. Clear film can preserve openness but may lose contrast against a busy interior or street scene.

Stand on both sides of the glass and test a small sample against the actual background. Daytime reflections and night-time interior lighting can change which side dominates visually. If the graphic is intended to communicate opening information or wayfinding, leave enough clear contrast around the functional message. Also check any applicable building, landlord or safety requirements before covering glass, especially near entrances and visibility-critical areas.

Match installation method to the specific film

Clean, dry glass and controlled handling are central to a tidy application, but wet and dry installation are not universal substitutes. Some films allow either method, while others have manufacturer-specific restrictions. 3M’s application guidance, for example, identifies several film constructions for which dry application is recommended and warns that liquid trapped under a graphic can prevent proper adhesion. Confirm the film model and follow its bulletin rather than copying a generic internet technique. Large graphics may require two installers, alignment marks and staged liner removal to prevent dust, creases and trapped bubbles. Do not install immediately after glass treatment or cleaning chemicals without checking compatibility. A small test area can expose unexpected adhesion or residue problems before the full pane is covered.

Write a usable installation brief

The brief should include pane dimensions, photos, intended view direction, application side, film type, finish, installation access and removal expectations. If a door is involved, note which direction it opens and where hands frequently touch the glass. Specify whether the graphic must be temporary for a promotion or durable for a longer-term shopfront identity; removability and residue expectations affect film choice. Provide a final visual proof that shows the artwork as viewed by the customer, not only as printed on the film. For multi-panel shopfronts, number each pane in the installation plan and file names. After installation, inspect the graphic from the pavement and from inside, then document any alignment issue while access is still available.

Frequently Asked Questions