Summary for kynar finish vs baked enamel Discussion
Kynar finish vs. baked enamel is explained as a durability question for outdoor galvanized sheetmetal panels. Terry Hickling says Kynar® is a polyvinylidene fluoride fluorocarbon finish that can last more than 25 years in weathering, while baked enamel may last less than a year outdoors; he also notes that Kynar requires a special primer and suggests contacting the supplier for details. Ron Zeeman adds that Kynar is a trade name for fluorocarbon finishes, which sit at the top of the outdoor coating hierarchy, ahead of urethanes, silicone polyesters, and standard polyesters. He says the surface is normally prepared with a zinc phosphate treatment and then primed with a urethane. The thread also includes later questions about roof slip factor and whether Kynar is always heat-baked, but no answers are shown for those follow-ups.
Q. Could you tell me the difference between a “Kynar” finish and a baked enamel finish on an outdoor galvanized sheetmetal panel. How is the surface prepared for a “Kynar” finish?
I would also like to know what a “fluoro” finish is.
Thanks for your assistance.
Thomas Fisher, PE
Consulting Engineer – Nashville, Tennessee, USA
September 4, 2008
A. Kynar® would last >25 years weathering, baked enamel < 1 year. Kynar® requires a special primer – contact supplier for further info.
Kynar® polyvinylidene fluoride, the homopolymer of 1,1-di-fluoro-ethene (VF2)
Terry Hickling
Birmingham, United Kingdom
September 8, 2008
A. Kynar® is a trade name for fluorocarbon finishes. On the hierarchy of finishes for outdoor exposure to weathering the fluorocarbons lead the list. Urethanes come next, then silicone polyesters and finally standard polyesters. All of these can be applied as baked on finishes.
The surface would normally be prepared with a zinc phosphate treatment and then primed with a urethane.
Ron Zeeman
Coil Coating – Brampton, Ontario, Canada
September 11, 2008
Q. Considering Kynar finish on a metal roof, how is the slip factor walking or standing compared to an asphalt roof? I am going up every year to clean out a wood stove flue on a side of the house that is 25 feet off the ground.
Willie N Nelson
– Franklin, Tennessee, USA
June 19, 2014
Q. Is all Kynar Paint heat baked? Is there any Kynar strictly wet sprayed and air dried?
Kevin Mullan
Storefront and Aluminum – Tampa Florida, USA
October 23, 2019