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Problem Solving Forum (15)


A specification for a bridge to be built of high-performance weathering steel requires an SSPC-SP 10, a profile of 3 to 5 mils, and metallizing with a final DFT of 10-12 mils. What challenges, time, and costs are associated with obtaining the profile?


What is the best way to assure compliance with specified dry film coating thickness requirements on vertical concrete?


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.


What generic types of coatings work best as liquid-applied air barriers, considering both cost and effectiveness, and what should be the dry film thickness of this system?


I have several 20-year-old carbon steel tanks for storing demineralized water. The original coating (type unknown) has started to blister. What material, at what DFT, should be used to refurbish the coating?


What do you do when the surface profile is higher than the dry film thickness of the specified primer?


What errors are most likely to occur when measuring dry film thickness on steel, and how can I avoid them?


Where are errors most likely to occur when measuring dry film thickness on steel, and how can they be avoided?


How does the concave or convex curvature of a surface affect the dry film thickness reading?


How do you measure the DFT or WFT of a film-forming sealer applied to a metallized coating (e.g., flame-sprayed zinc)?


How do you calibrate a DFT gauge in the magnetic field of a live power plant to measure coatings on steel substrates?


Which DFT statistics should be recorded in a daily inspection report, and why are they relevant to a good coating QC record?


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 generic types of coatings work best as liquid-applied air barriers, considering both cost and effectiveness, and what should be the dry film thickness of this system?


What is the best way to assure compliance with specified dry film coating thickness requirements on vertical concrete?


 
 
   

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