PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

Advertisement

PaintSquare


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

Advertisements
 
HoldTight Solutions Inc.
 
NO FLASH RUST - NO CONTAMINANTS
 
Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com
 

 
DeFelsko Corporation
 
PosiTector SHD Shore Hardness Durometer
 
PosiTector SHD measures the hardness of non-metallic materials. Features a measurement timer, auto ignore mode and internal memory. Shore A or D available.
 

 
Industrial Vacuum Equipment Corp.
 
Hurricane Vacuums
& Dust Collectors
 
Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com
 

 
SAFE Systems, Inc.
 
Portable Dust Collectors for Tough Environments
 
Trailer and skid-mounted models in numerous sizes, powered by electric and/or diesel. Sloped roofs, multiple dust inlets, high static, dampered fans. Lockable power & drive compartments.
 

 
KTA-Tator, Inc. - Corporate Office
 
KTA Analyzes
Coating Failures
 
• Field Diagnosis
• Lab Diagnosis
• Determination of Cause
• Recommendations
www.kta.com
Call 1-800-245-6379
 

 
Fischer Technology Inc.
 
NEW Protective Coating Inspection Website
 
Click Here!
 

 
US Minerals
 
Hit Harder. Clean Faster.
 
Black Diamond abrasive products are the toughest, most effective blasting media and supply the superior power you need to get any job done.
 

 
Modern Safety Techniques
 
Modern Safety Techniques
 
With our unique LTCat, we can help to provide clean, safe breathing air to your workers. Take a look at our Breathing Air Systems, we supply at least twice as much charcoal as our competitors! Modern
 

 
Detail Masters
 
Overspray Removal
 
We offer professional, turnkey service and unparalleled quality!
Our process can save hundreds— even thousands of dollars. It's fast, environmentally safe and 100% guaranteed.
 

 
Polygon
 
POLYGON - Temporary Humidity Control
 
We specialize in innovative climate control solutions for industrial painting, utilizing alternative energy sources and combining desiccants with heating or cooling.
 

 
 
 

Technology Publishing Co., 2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951

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


The Technology Publishing Network

Durability + Design 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   |   Site Map   |   Search   |   Contact Us