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Problem Solving Forum (9)


What would be a reasonable service life for a two-coat, zinc-rich epoxy/epoxy mastic system, about 200-250 microns, in a marine environment? What evidence is there from the field?


What are the significant performance differences between an inorganic zinc primer (ethyl silicate) and an organic zinc primer (epoxy), given the same application and exposure conditions?


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


How does a lower-metallic-content zinc-rich epoxy affect the life of a paint system?


What are the pros and cons of using an organic vs. inorganic zinc primer?


What are the significant performance differences between an inorganic zinc primer (ethyl silicate) and an organic zinc primer (epoxy), given the same application and exposure conditions?


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 of DFT.


What are the significant differences in performance between an inorganic zinc primer (ethyl silicate) and an organic zinc primer (epoxy), given the same application and exposure conditions?


If I apply a zinc-rich epoxy primer at 3 mils’ dry film thickness in the shop with air temperature of 90 F, what checks can I make to determine when it is safe to handle and stack the primed steel components?


 
 
   

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