Problem Solving Forum

| More

November 25 - November 29, 2019

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 Aajjay Sunkay of ASSETReifurb Engineerrs on November 27, 2019:
The objective in using an OZEU system is to protect the metal surface. The primer layer of organic zinc-based coating protects by sacrificial means, followed by epoxy coating as intermediate coat and urethane as top coat . Zinc particles blended blended with the organic, liquid resin  are most important and act as a sacrificial anode and form an oxide layer to protect further. The  intermediate coat and top coat protect the surface by their barrier properties. Hence, the life span of this coating system is assured by the cumulative effect of all these inherent characteristics of the different coats. When we use a roller nap for application of the zinc-based organic coating, zinc particle get trapped in the roller and only liquid will lie on the metal surface, which results in an uneven quantum of zinc particles on the surface, which will  hamper the basic objective of sacrificial anode formation and weaken the oxide film formation,  keeping open sites in the film for liquid to reach to metal surface. Hence, application of an OZEU coating system with a roller nap reduces the life span of coating.  It  needs to be applied by spray with thorough stirring of the paint before application.

From Erik Andreassen of CPS on November 25, 2019:
A roller should never be used for application of a zinc coating. For people in our trade, the reasons are obviously known: air inclusions, lack of wet film application, only liquid applied instead of zinc. Other coats can be applied but not recommended if you require a high build system.

Please sign in to submit your answer this question    

Tagged categories: Brushes and rollers; Coating Application; Paint application


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
KTA-Tator, Inc. - Corporate Office

 
Fischer Technology Inc.

 
NLB Corporation

 
ABKaelin, LLC

 
DeFelsko Corporation

 
Tarps manufacturing, Inc.

 
SAFE Systems, Inc.

 
Modern Safety Techniques

 
Mitsubishi Gas Chemical America

 
HoldTight Solutions Inc.

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy Policy   |   Terms & Conditions   |   Support   |   Site Map   |   Search   |   Contact Us