How can I check if the nC Corrosion Passivator Primer 2-in-1 has been applied correctly?

This can be easily tested: if the surface still feels sticky, the nC Corrosion Passivator Primer 2-in-1 is not yet completely cured. More information about application and the dry time can be found in the Product Data Sheet (PDS). 

More information can be found on the product page.