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Corrosion-Resistant Paint
comments (0) April 24th, 2009 in Blogs
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Polyvinylidene fluorides, or PVDFs, are acknowledged in the industry as the best resins for coating metal.
by David Hall
Although metal makes for a durable roof, it does corrode. That’s one reason why lots of metal roofs are painted (another is that you might want a green, red, or blue roof rather than just plain metal).
Like all paints, the stuff used to coat metal roofs varies in quality. All paints have three basic components: pigments, resins, and solvents. Solvents do their job by mixing together the pigments and resins, then disappearing as the paint cures. Pigments provide the color, and resins protect the pigments and make everything stick to the metal.
Polyvinylidene fluorides, or PVDFs, are acknowledged in the industry as the best resins for coating metal because of their superior ability to resist fading, chalking, staining, and chemicals, and because of the way they retain gloss. The original trade name for PVDF resin is Kynar; while it’s almost synonymous with PVDF, other brands are available.
Not all factory-coated, Kynar-based products are the same. Products with 70% Kynar in the resin are most durable. Higher concentrations won’t coat as well, and lower ones aren’t as durable. While most top-quality products contain the optimum amount of Kynar, some companies use coatings with only 50% PVDF resins. When buying a metal roof or any other painted exterior metal, specify that they be coated with products that contain Kynar 500 or Hylar 5000, another popular brand name; those two designations guarantee that 70% of the resin is made from PVDFs. Everything else is just paint.
| Read the complete article... A Contemporary Long House Inspired by Northwest Native American homes, a new retreat points its gabled prow seaward and shows off its structure inside by David Hall  |
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posted in: Blogs, roofs, painting, paint
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