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

December 17 - December 23, 2012

What causes bubbling or cratering of epoxy intermediate coat when applied over epoxy zinc-rich primer?

More items for Coating Materials


Selected Answers

From sasha bacic of none on December 18, 2012:
    The zinc-rich primer is a porous coat in which the air is entrapped. To avoid bubbling, there are two solutions: overcoating with a specifically formulated, so-called "sealing" coat before application of the subsequent coat; and using the so-called technique, "full-over-the-mist," which consists of diluting the coating up to 60% or more, then applying it in the form of a mist onto the zinc primer. The highly diluted paint will penetrate into the porosities of the primer and seal them. The next step is to apply the non-diluted paint immediately after the mist coat to ensure perfect adhesion. Of these two methods, the applicator may select the one with which he is more comfortable (depends of the experience of the applicator) and which is acceptable to the client. Comparative testing is recommended to assert which method to select. Contractor and client shall sit down and agree on testing parameters and evaluation criteria. It is far better to discuss before than after.

From Jorge Lizarraga of International Paint on December 17, 2012:
     Bubbling is caused by the air trapped among the zinc particles. To avoid this effect, it is necessary to apply a very diluted first coat in order to displace the air. Then, coat it as normally.

From Kiran Pawar of Berger Paint Bahrain on December 17, 2012:
Porosity present in the zinc-rich primers is responsible for the generation of bubbling or blistering when topcoated with thick coatings. In order to avoid this situation, apply a thin coat as a mist coat before going for thick coat.

Please sign in to submit your answer this question    

Tagged categories: Epoxy


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

Advertisements
 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
Carboline Company
 
History. Service. Innovation.
 
We are a global leader in coatings, linings, and fireproofing. We have the right people, right products, and right locations.
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
SABRE Autonomous Solutions
 
Repeatability
 
The ALPHA1 provides reliable results consistently allowing you to cost your next job with confidence.
 

 
PPG Protective and Marine Coatings Group
 
We Protect and Beautify the World
 
PPG is widely recognized as a world leader in protective and marine coatings, developing innovative, cutting-edge products and services.
 

 
Sherwin-Williams
 
Sherwin-Williams Protective & Marine Coatings
 
With 4,000 distribution points and 3,700+ years of combined experience, Sherwin-Williams delivers the products, support and expertise you need, right where you need it.
 

 
Jotun Paints Inc.
 
Jotun Jotachar 1709
 
Mesh-free passive fire protection epoxy designed to protect against hydrocarbon pool fire scenarios for up to four hours as defined in the ANSI/UL1709 standard.
 

 
Safway Services
 
Safeguard Assets. Ensure Productivity. HAKI®
 
Protect assets and equipment. Keep facilities open and operational. Maintain schedules regardless of weather. Ensure smooth and continuous production. Easy to erect. Safway is the primary distributor of HAKI® products including HAKISPAN and HAKITEC® 750 – in North America.
 

 
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.
 

 
Aggreko
 
Dehumidification, Power and Temperature Control Rentals
 
Aggreko offers rental solutions for your painting/coating project. Dehumidifiers, cooling, heating, power and 24/7 service, nationwide.
844-433-9802
 

 
 
 

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

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