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Problem Solving Forum (13)


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


How do concrete admixtures such as hardeners and anti-dust compounds affect coating adhesion? What can be done to minimize negative effects?


In reviewing the testing data for adhesion, some manufacturers indicate ASTM D4541 results while others show ASTM C3359 results. Is it possible to compare one against the other? For example, does 1037 psi provide better adhesion than 4A?


Why would a pull-off adhesion test give a high value (no failure) for a solventless epoxy that later showed poor adhesion in service?


How do you accurately measure the adhesion of inorganic zinc?


How do you adequately assess the adhesion of a newly applied coating?


How do you adequately assess the adhesion of a newly applied coating?


How do concrete admixtures such as hardeners and anti-dust compounds affect coating adhesion? What can be done to minimize negative effects?


Why would a pull-off adhesion test give a high value (no failure) for a solventless epoxy that later showed poor adhesion in service?


When should the adhesion of an applied coating or lining multi-coat system be tested?


How do you adequately assess the adhesion of a newly applied coating?


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


How do admixtures to concrete (hardeners, anti-dust compounds, etc.) affect coating adhesion? What can be done to eliminate or minimize negative effects?


 
 
   

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