PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free Specialty Function Coating Systems eResource Book

Problem Solving Forum

| More

August 18 - August 22, 2014

How do you measure wet film thickness on shop-applied organic zinc-rich primers to accurately predict dry film thickness? Our shop applies a great deal of OZ primer, and we have found that WFT readings with a standard gauge are not accurate predictors.



More items for Quality Control


Selected Answers

From Larry Muzia of Exceletech LLC on August 22, 2014:
 The wet gage measurement is not exactly accurate  because the metallic zinc particles do not allow the two ends of the gage to make direct contact with the substrate. They are a solid, and if zinc is under the edge, it will prove to be inaccurate. The is the case with both organic or inorganic zinc filled coatings. I agree that an agitated pot or very low speed agitator in the bucket if spraying airless is a must. Remember to keep the speed low to avoid inducing a vortex sucking moist air into the product if the humidity is high. As for accurately measuring the wet film, the use of a wet film gage will give you an approximate reading, although it will not be 100 % accurate. Experience is never out of style, and, typically, these materials dry within hours, allowing a confirmation using a dft gage.

From Steve Brunner of WPC Technologies on August 19, 2014:
I find it odd that a wet film gauge does not yield accurate predictions. Given that, I recommend consistency and a practice board. On the former, thinning the same to a consistent viscosity will keep the solid content nearly identical from batch to batch. Then use a practice (pattern) board for the applicator to determine gun pattern, adjust the application equipment and helps out the applicator with the arm speed. I have seen a lot of applicators who use practice/pattern boards and always end up being spot on with the DFT. The last issue is use of an agitated pot. It has been my experience that zinc-rich coatings will settle in rapidly, thus the need to keep agitated. If not agitated, the coating will have an inconsistent solids content.  On this last thought, this could be the problem and the easiest fix.

Please sign in to submit your answer this question    

Tagged categories: Coating / Film thickness; Dry Film Thickness (DFT); Wet film thickness


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

Elcometer, Inc.
Elcometer 266
DC Holiday Detector

Easily Finds Pinholes, Flaws & Thin Spots; Safer, More Reliable Testing; Voltage-Adjustable Keypad; Dual-Safety Switch On Handle.


Fischer Technology Inc.
Measure TSA Coatings on Stainless Steel

The PHASCOPE® PMP10 from FISCHER precisely measures thermally sprayed aluminum (TSA) on stainless steel.


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


SSPC: The Society for Protective Coatings
http://www.sspc.org/

Join SSPC and Enhance
Your Career !


KTA-Tator, Inc. - Corporate Office
KTA-Tator
Coatings Inspection

Any structure, any height, any place - A qualified coatings inspector is always available. Call 800-245-6379.


RPB Respiratory
AN INSTANTLY CLEAN VISOR? HOW IS THAT POSSIBLE?

With RPB Safety’s new Nova 3 Cassette Lens System which has been specifically designed to save you time and money! See the benefits for yourself now!


N.T. Ruddock Co.

Our Abrasives Hold Up Under Pressure

N. T. Ruddock focuses on abrasive selection, equipment evaluation, equipment maintenance & reduction of abrasive consumption. Other services include Screen Analysis & Background Radiation Testing.


Advanced Recycling Systems
ADVANCED RECYCLING SYSTEMS (ARS)

Recycling Machines, Dust Collectors, Rapid Deployment units are time-tested and approved for the rugged industrial environment. Contact ARS today!
(330)536-8210


U.S. Zinc
Zinc. Quality With U.S.

We provide a superior experience to each of our customers. Through added infrastructure, we have become a fully integrated REACH-registered supplier.


Atlantic Design, Inc.
BUILDING INNOVATION, NOT IMITATION

The smallest version of our Blast Vacuum Recyclers, this ADI 2300CFM 2-Pot is a cleverly designed power package for those smaller jobs. 866.Call.ADI

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design 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   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2015, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com