PVDF vs Polyester Coatings for Aluminium Cladding

PVDF coatings offer superior UV resistance, colour retention, and chalking resistance over 20-plus years, making them the benchmark for high-exposure architectural facades. Polyester coatings - particularly superdurable formulations - deliver solid performance at lower cost and are well suited to standard environments and textured finishes. The right choice depends on the project’s exposure, appearance requirements, and budget.

What are the two coating families?

Almost all factory-applied colour finishes on architectural aluminium fall into two groups: PVDF (polyvinylidene fluoride, also sold under the resin trade names Kynar and Hylar) and polyester (including superdurable polyester and super polyester variants).

PVDF resins contain carbon-fluorine bonds - among the strongest in organic chemistry - which give them exceptional resistance to UV degradation, chemical attack, and weathering. Polyester resins are less inherently UV-stable but have improved significantly, with superdurable formulations bridging much of the gap for standard applications.

PVDF is typically applied as a wet-spray (coil coat or spray line), while polyester is commonly applied as a powder coat. Both produce durable, factory-controlled finishes, but the film properties, thickness, and repairability differ.

How do they compare in practice?

Colour and gloss retention. PVDF holds its colour and gloss longer under sustained UV exposure. AAMA 2605:2020 - the benchmark for high-performance coatings - requires less than 5 Delta E colour change and less than 30% gloss loss after 10 years of south Florida exposure. Superdurable polyester tested to AAMA 2604 allows more degradation over the same period. The difference is most visible on darker and saturated colours.

Chalking resistance. PVDF resists chalking - the powdery surface residue caused by binder breakdown - better than polyester over the long term. On dark panels in high UV or coastal locations, the difference shows within a decade.

Chemical resistance. PVDF is more resistant to acid rain, industrial pollutants, and salt spray. For facades near the coast or adjacent to heavy industry, this margin matters.

Cost. PVDF coatings typically add 20-30% to the finishing cost compared to standard polyester. On a full facade project the coating premium is a small proportion of total installed cost, but it is real.

Repairability. Powder-coated polyester finishes are generally easier to touch up on site. PVDF wet-spray finishes are harder to repair to an invisible standard. Worth considering for projects where post-installation handling risk is higher.

When should you specify PVDF?

PVDF is the appropriate choice when the project demands long-term appearance retention in challenging environments:

Coastal and tropical locations with high UV and salt exposure
North and west-facing facades receiving sustained direct sunlight
Buildings where the facade is a defining architectural element and appearance standards are contractually defined over 15-20 years
Specifications referencing AAMA 2605 performance requirements

Valmond & Gibson’s element13 solid aluminium panels use PPG PVDF paint finishes, tested to AAMA 2605:2020 by Intertek Shanghai (report 210203002SHF-001). This is the coating system behind element13’s 20-year warranty covering both substrate and finish.

When is polyester the right call?

Superdurable polyester coatings deliver good performance for a wide range of projects, and specifying PVDF where it is not needed adds cost without proportionate benefit:

Standard inland environments with moderate UV exposure
Projects where budget is constrained and the coating environment does not demand PVDF-level performance
Textured and woodgrain finishes, which are predominantly polyester-based - the texture profiles and woodgrain transfer processes work with polyester powder coat chemistry
Facades where a shorter recoating cycle is acceptable or where the building has a defined design life under 20 years

interloQ interlocking rainscreen panels are finished with Interpon D2525 superdurable polyester powder coat, including the Structura texture range. Interpon D2525 is formulated for architectural exteriors and provides strong UV and weather resistance for its class. Like element13, interloQ carries a 20-year warranty covering substrate and coating.

Powder coat vs wet spray - a note on application

The PVDF-versus-polyester decision often gets conflated with the powder-coat-versus-wet-spray decision, but they are separate questions. PVDF can be applied as wet spray (the more common method for flat panel products like element13) or as a powder coat. Polyester is almost always applied as a powder coat for architectural aluminium.

Powder coating produces a thicker, more impact-resistant film - typically 60-120 microns. Wet-spray PVDF is thinner - typically 25-35 microns - but the resin’s inherent durability compensates. Both are factory-controlled processes with consistent quality when applied by reputable coaters.

What should the specification say?

If the project requires high-performance coatings, reference AAMA 2605:2020. This is the recognised benchmark and it removes ambiguity about what “high performance” means. For standard applications, AAMA 2604 or AS 3715:2002 (the Australian standard for thermoset powder coatings) provides a clear performance baseline.

Avoid specifying a resin type without a performance standard. Saying “PVDF coating” without referencing AAMA 2605 leaves the door open to lower-grade PVDF formulations that may not deliver the performance the design intent requires.

The short version

PVDF for high-exposure, long-term appearance retention, and AAMA 2605 compliance. Superdurable polyester for standard environments, textured finishes, and projects where cost efficiency matters. Both are credible choices when matched to the right application - the coating should suit the project, not the other way around.

Need help choosing the right finish? Talk to our team - we supply both PVDF and polyester-finished systems and can match the coating to your project.

Last updated: 4 April 2026

PVDF vs Polyester Coatings for Aluminium Cladding