Loctite 331 structural adhesive is acid-free, 2-step acrylic that fixtures in 20 sec and develops full strength in 30 min, bonding magnets and metals of all sizes. Designed for filling large gaps, Loctite 3060 structural adhesive is acid-free, 2-component, external-mix acrylic featuring 2 cascading adhesive streams that automatically mix together. Loctite E-220IC Hysol epoxy adhesive is acid-free, one-component epoxy designed for induction cure operations.