Loctite

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Loctite is an adhesive used to prevent screws and bolts from coming unscrewed. The brand is owned by Henkel.

[edit] Grades

Blue Removable No. 242 (Berry) - Used for things you may want to unscrew with minimal hassle. It cures into a brittle, glassy bond that takes one good twist to break, but removes cleanly after that.

Red High-Strength No. 271 (Cherry) - Used on things that you don't want to take apart for a long time. May require heat from a torch or iron to loosen its grip. It cures into a thicker, sticky bond that holds up better against vibration and shocks.

Green - penetrating grade for use on parts that have already been assembled.

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