LOC-TITE THREAD LOCKER
                   By Carl Thomason, from the Sparkplug, of the Beach Cities Inland Empire Chapter, So. Cal. 
                     
                   Frequently, the product  LocTite  is referred to as a way to keep bolts and nuts from loosening. However,
                   many people do not know that 
                   there is more than one type of LocTite and what each type is used for. Having worked in manufacturing for
                   over 45 years, I am very familiar 
                   with these uses. These are the ones most commonly used:   

                   Permanent Type ( Red ) : LocTite # 262, high strength, or #271, very high strength  these should be used
                   where you never anticipate removing them. 
                   However, if you find that necessary, there is a way to cause this type of LocTite to release. Use a propane or
                   acetylene torch to warm the item. 
                   Dont heat it too quickly, or it will  cook  the LocTite into a hard glob. Then, while it is still warm, remove
                   the nut or bolt. Of course, this procedure may create problems if done near paint or flammable materials, so
                   use caution. 

                   Removable Type ( Blue ) : LocTite # 242, .This is used if, in the future, 
                   you may need to remove the nut or bolt. It is not necessary to use any heat on this type to make it release, and
                   is, therefore, usually the best choice. 

                   Cylindrical Type ( Green ) : LocTite # 609, high viscosity / high temperature, and # 680, medium viscosity / high
                   strength. This is used when you must fill and  voids  or wear on a shaft when mounting a gear or pulley. It is
                   usually not necessary to use any heat on this type to make it release. Remember to clean the oil off the mating
                   parts before using LocTite. Acetone or plain alcohol usually works well.