Loctite 312 structural adhesive is an ultra fast setting, two step acrylic, no mixing required, amber adhesive. 312 has a very low viscosity and should be used in conjunction with Loctite primer 736 to create a tough durable bond on close fitting parts. Magnetic bonding structural adhesive. - Loctite 312 typical applications include bonding dissimilar materials such as metals, glass or ceramics and where fast fixturing is required between close fitting parts.