For years, gunsmiths have turned to Loctite for securing screws and other threaded parts on their projects. Each formula has unique features that make it perfect for various applications around the shop. Blue Threadlocker (242) is used for mounting bolts, pumps and compressors. Recommended for fasteners from 1/4" through 3/4". This non-wicking formula cures in 10 minutes with full strength in 24 hours. Medium strength, requires hand tools to remove once applied.