Pressure-Sensitive vs. Dry Adhesive

Every window film needs to bond to glass, but the two adhesive systems Flexfilm uses — pressure-sensitive adhesive (PSA) and dry adhesive (sometimes called CDF adhesive) — get there in very different ways. Neither is universally "better"; each is suited to a different kind of installation.

Pressure-Sensitive Adhesive (PSA)

Carbamate HD, used in Terraflex, Panaflex, and Nanoflex, is Flexfilm's pressure-sensitive adhesive. PSA is inherently sticky and bonds instantly on contact — no activation step required.

How It Installs

Even though PSA bonds immediately under pressure, installers still use a wet installation method: both the glass and the film go on wet, which slows the initial stick just enough to allow positioning. Once the film is placed and squeegeed, the water is pushed out and the adhesive bonds right away.

Where PSA Shines

• Curved or contoured glass, like automotive windows, where instant hold helps the film settle into the curve
• Areas needing immediate hold, like near defroster lines or on roll-down windows
• Situations calling for a fast, straightforward application without a lengthy bonding period

Dry Adhesive

Dry adhesive, commonly used on architectural (flat glass) film, feels completely different — there's no stickiness when you touch it, thanks to a special top coat.

How It Installs

Dry adhesive requires activation with a slip solution during installation. Rather than bonding instantly, it undergoes a slower chemical bonding process with the glass over time, gradually revealing an underlying pressure-sensitive layer as it cures.

Where Dry Adhesive Shines

• Large, flat glass: its non-sticky nature before activation makes it much easier to handle and adjust on big windows.
• Contamination resistance: if debris gets under the film during installation, it can be pulled back, rinsed, and reapplied without compromising the adhesive — something PSA doesn't forgive nearly as easily.
• One-person installs on large pieces: techniques like the reverse roll method make it realistic to install large sheets of dry-adhesive film solo, since the film isn't fighting you the way an instantly-tacky adhesive would.

Side-by-Side Comparison

Which One Do You Need?

You generally won't choose an adhesive type directly — it comes built into the film you select. Automotive films use PSA because instant hold matters on curved glass and roll-down windows. Architectural films use dry adhesive because the slower, more forgiving bonding process makes large, flat installations far more manageable. Some installers do use pressure-sensitive adhesive on flat glass successfully, but dry adhesive's flexibility during installation is why it remains the go-to choice for most architectural professionals.

Helpful Links

• Terraflex Carbon Window Film
• Panaflex Ceramic Window Film
• Nanoflex Premium Ceramic Window Film