Threadlocking adhesive - medium/high strength. Ideal for locking preassembled fasteners. Loctite 290 is a liquid medium/high-strength thread locker designed for the locking and sealing of threaded fasteners. Because of its low viscosity and capillary action, The product wicks between engaged threads and eliminates the need for disassembly prior to application. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. The product can also fill porosities in welds, castings and powdered Metal parts.