Loctite

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Loctite are a brand of adhesives used as threadlockers, to prevent screws and bolts from loosening, more effectively than a locking washer alone could. It is an anaerobic adhesive that's based on methacrylate.

[edit] Grades

Loctite comes in different grades of strength, to suit the particular application.

Blue Removable No. 242 - 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. Preferably to be used with Valve Covers, Water Pumps and Oil Pan Bolts.

Red High-Strength No. 271 - Used on things that you don't want to take apart for a long time. It requires heat from a torch or iron (to 500° F) to loosen its grip. It cures into a thicker, sticky bond that holds up better against vibration and shocks. Preferably to be used with automotive and mechanical operation such as nuts and bolts on Cars, Motorbikes, Ski-doo's and Boats.

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