Loctite instant universal low viscosity toughened gel amp flexible adhesives loctite 135428 loctite 401 is designed for the assembly of difficult to bond materials which require uniform stress distribution and strong tension andor shear strength it provides rapid bonding of a wide range of materials including metals plastics and elastomers loctite 401 is also suited for bonding porous materials such as wood paper leather and fabric loctite 401 instant adhesive universal low v