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Problem Solving Forum (11)


Should pull-off adhesion tests be carried out on a zinc-rich primer alone, or only on a complete system?


Is there any method to take accurate wet film thickness readings when applying zinc rich primers?


Can an epoxy polyamide zinc phosphate primer be overcoated with a synthetic enamel alkyd-based topcoat? If no, why not?


During newbuilding, do I have to stripe coat edges if I am using an edge retention primer?


Are there special primers and surface preparation requirements for painting unpainted aluminum?


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


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


If a paint data sheet notes a required primer thickness of 125 microns, but the project specification calls for 50 microns, how is this resolved?


When and why would I need to stripe coat if I’m using an edge-retention primer?


What steps must be taken to mitigate poor adhesion over an existing aged silver aluminum paint? What primer will achieve good adhesion?


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.


 
 
   

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