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Problem Solving Forum (3)


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


On guardrails on a marine wharf, grating panels consisting of mild steel bars about 1/8-inch by 1-inch on a 2-inch-square grid were painted with a three-coat zinc/epoxy/urethane system. Inspectors are finding numerous pinholes in the finish coat along the inside corners of the grating where the 1-inch-thick bars meet at a 90-degree angle. These pinholes were not noticed in the zinc or epoxy coats, but the final coat's visual inspection is more detailed. What is the likely cause of the pinholing, and what could be done to prevent it on future applications? Also, what should the disposition of the parts with pinholes be, as in, repair, accept as is, reblast and recoat, or an alternative?


For coatings with a high-solids content (95% or more), what kinds of defects, such as holidays or micropores, are possible or likely to occur in the applied film? How can these be prevented or remedied?


 
 
   

Sika-Us
Sika® Industrial Floor Coatings

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NACE International, The Corrosion Society
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Specialty Products, Inc. (SPI)
Polyurea & Polyurethane Spray Foam Training

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SAFE Systems, Inc.
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RBW Enterprises, Inc.
Robotic Blast Cleaning & Painting News

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HoldTight Solutions Inc.
NO FLASH RUST - NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rust
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US Minerals
US Minerals -
Black Magnum

With nationwide production and distribution capabilities, U.S. Minerals supplies a complete range of coal slag and other abrasives to meet all of your blasting needs.


WINOA Group
W Abrasives - Surf Prep Pack

Experts in surface preparation are not working only on greens. To discover the SURF PREP PACK dedicated to experts. Visit our website, www.wabrasives.com.


Dehumidifiers, Sales and Consulting
How long can you hold a WHITE-METAL BLAST?

Click to learn how 30 DAYS is easy! Don Bechtol has over 40 years of experience utilizing DH for blasting/coating projects. Call today.
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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.

 
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