Anaerobic adhesive (it cures and hardens only when shut off from air between tightly fitting metal surfaces).Strength: Medium strength. It permanently locks fasteners to prevent them from vibrating loose, but still allows you to disassemble the parts later using standard hand tools.Liquid Color: Blue (even though the plastic bottle container is red).Common Applications: Ideal for locking and sealing mechanical parts like engine bolts, nuts, studs, pumps, and general machinery fasteners ranging from size M6 to M20.