Strong bonded joints begin before any adhesive touches the parts. Loctite 7649 (SKU 00211) is a solvent-based primer and activator that conditions metal surfaces ahead of Loctite 326 adhesive, giving the bond the reactive surface it needs to cure quickly and completely. It matters most on less reactive metals, stainless steel and plated finishes among them, where an unprimed bond can cure slowly or unevenly. Wiped onto the joint area and allowed to flash off, the primer helps railing flanges and fittings reach dependable full strength, protecting the integrity of every assembled connection.