What is the specification of the TT-P 645B primer?

The specification of the TT-P 645B primer indicates that it is designed as an alkyd primer that contains Zinc Molybdate as an inhibitive pigment. This specific formulation is significant because Zinc Molybdate serves to provide corrosion protection by inhibiting the formation of rust on metallic surfaces. The inclusion of this inhibitive pigment is a crucial characteristic that enhances the primer’s effectiveness in environments where metal surfaces are exposed to moisture and corrosive elements.

Understanding this aspect is vital for anyone involved in paint inspection, as it highlights the primer’s protective properties and its suitability for various applications, particularly on ferrous and non-ferrous metals. The other options do not accurately describe the TT-P 645B primer's formulation or purpose, thus emphasizing the importance of knowing the correct specifications for effective use in the field.