Loctite Threadlocker Blue 242 is a blue-colored threadlocker that is designed to be used in a variety of applications. This threadlocker is effective in preventing the movement of parts that are jointed together, and it can be used in a variety of applications including construction, manufacturing, and automotive. Loctite Threadlocker Blue 242 is a blue-colored threadlocker that is designed to be used in a variety of applications. This threadlocker is effective in preventing the movement of parts that are jointed together, and it can be used in a variety of applications including construction, manufacturing, and automotive.