Loctite structural bonding adhesives loctite 254039 loctite ea 3423 structural bonding is a two component high viscosity thixotropic epoxy adhesive that cures at room temperature after mixing it is a general purpose non sag adhesive that develops high strength on a wide range of substrates its thixotropic properties enable loctite 3423 to bond rough vertical surfaces made from metal ceramic rigid plastics or wood through gaps of up to 3mm when cured the adhesive can be sanded to a sm