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September 19 - September 23, 2016

Does roller nap decrease the lifespan of a three-coat OZEU (organic zinc prime coat, an epoxy intermediate coat, and a urethane finish coat) paint system? Is there a visual guide or specification for this in the industry or test results available for study?

Selected Answers

From Paiboonsak S of CFT on November 4, 2016:
Normally, a roller is not recommended  for applying protective coating primers  because the coating  cannot achieve good wetting of the surface by roller application. Also, the thickness cannot be easily controlled compared to spray gun application.

From Eric Williams of Fought & Co. Inc. on October 7, 2016:
Roller nap in nature has a tendency to allow the zinc to absorb and pack into the nap, creating zinc load and then no zinc load during application on the surface. Without full cathodic contact, the coating system is reliant on barrier protection, which does have a direct impact on service life of this coating system. I am not aware of any technical data or studies performed on this application process.

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Tagged categories: Asia Pacific; Brushes and rollers; Coating Application; EMEA (Europe, Middle East and Africa); Latin America; North America; Paint application

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