PVDF (fluoropolymer) paint lasts significantly longer than polyester paint on aluminum. A 70% PVDF finish holds its color and gloss for 20 to 30 years outdoors, while a standard polyester finish typically begins to fade and chalk within 5 to 10 years. Polyester costs less and works well indoors or for short-term projects, but PVDF is the clear choice for exterior and architectural aluminum.
What is the difference between PVDF and polyester paint?
PVDF (polyvinylidene fluoride) is a fluoropolymer resin engineered for extreme weather resistance; the 70% PVDF class is sold under names like Kynar 500® and Fluropon®. Polyester is a lower-cost thermoset resin that produces a hard, glossy film but lacks the fluoropolymer chemistry that resists UV breakdown. The core difference is how each holds up to sunlight, moisture, and pollution over time.
PVDF vs polyester: side-by-side
| Property | 70% PVDF | Polyester |
|---|---|---|
| Color retention | Excellent, 20+ years | Moderate, fades in 5 to 10 years |
| Gloss retention | Excellent | Good early, dulls over time |
| Chalk resistance | Very high | Low to moderate |
| Formability | Excellent, bends without cracking | Good |
| Typical warranty | Up to 30 years | 5 to 10 years |
| Relative cost | Higher | Lower |
| Best use | Exterior, architectural, coastal | Interior, signage, short-term |
When should you choose polyester instead of PVDF?
Polyester makes sense when the aluminum is used indoors, for temporary displays, or on a tight budget where a 5 to 10 year finish is acceptable. It comes in a wide color range and takes a high initial gloss. For sign blanks and interior panels that are not exposed to the elements, polyester is often the practical pick. See aluminum sign blanks for signage-specific options.
When is PVDF the better investment?
Any exterior surface, especially building facades, roofing, and anything near saltwater, should use 70% PVDF. In coastal and high-UV climates the difference is dramatic; see choosing aluminum finishes for coastal and high UV environments. Wrisco stocks 70% PVDF painted aluminum in over 50 colors on the painted aluminum sheets page.
Frequently asked questions
Is PVDF paint worth the extra cost over polyester?
Outdoors, yes. PVDF typically lasts two to three times longer, so the lifetime cost is usually lower despite the higher upfront price.
Does polyester paint chalk faster than PVDF?
Yes. Polyester tends to chalk and fade within several years of sun exposure, while 70% PVDF resists chalking for decades.
Can both finishes be formed and bent?
Both can be formed, but PVDF is especially flexible and resists cracking during roll forming and brake bending.