What is the role of primer when used beneath SFRM on a column?

The correct answer emphasizes the role of primer in improving bond strength between the spray-applied fire-resistant material (SFRM) and the substrate, such as a column. A primer is specifically designed to create an adhesive layer that enhances the mechanical connection. This is crucial because a strong bond ensures that the fire-resistive material remains securely attached under various conditions, particularly during exposure to high temperatures and fire.

A well-bonded SFRM directly contributes to effective fire protection since it allows the system to function as intended without delaminating or falling off during a fire event.

While enhancing fire resistance, increasing durability, and facilitating easy application may also be beneficial aspects associated with the use of primers in some contexts, they are not the primary roles regarding SFRM application. The main focus here is on achieving optimal adhesion to uphold the fire protection integrity of structural elements.