Originally Posted by
fietsbob
Blue is thread lock , red is for sealed bearing mounting etc......Color coded product Green. Black , and several other products larger gaps filled..higher strength.. harder to remove , without heating up the parts..
http://www.loctiteproducts.com/
Your own link to the Loctite product literature shows this is incorrect. They list a Blue (Grade 242), Red (Grade 271) and Green (Grade 290) product all as threadlockers. Blue is the weakest, Red is much stronger and Green is a weak locker but used on preassembled bolts and nuts since it wicks into the threads.
In the past I recall a much larger range of both thread lockers and bearing/cylindrical fit retainers but the color code was always insufficient to tell what was what. Both red and green colored products were sold as both thread lockers and bearing/cylindrical fit products in a wide range of strengths. The only definitive way to tell which product was for what use was by grade number.
Incidentally here is a link to a table listing all of the Loctite products:
http://www.type2.com/library/chemicals/loctite.htm
Note that there are numerous products and strengths in each of the common colors (blue, red and green) as well as several products in colors we never see as bike mechanics.