I am looking to loctite my sight screws and see that there are several loctite formulas out there. What loctite number would you use so the screws could still be taken out at a later date? Thanks.

i use the blue one.

# 222 low strength
243 medium strength

#222 is formulated for screws smaller than 1/4" so if you must, use that one.

loctite is formulated to break down at quite a low temperature so all that is needed is to heat the part with the screw until it comes loose.

The blue 242.
It takes a day to harden and it is soft at boiling water temperature.
JMHO
Martin

use the blue, had a friend use the green and the mount screws were a pain to get out.seems it was for locking down wear sleves on engines.

DO NOT use the red stuff. It is for near-permanent lockings. It requires temperatures of around 400-425 degrees to melt it. Use the blue stuff like everyone else has said...

No doubt, Blue.

The Red is great stuff but it is next to permanent.

If you want to have them there forever try the black stuff. #380 Black Max, store refrigerated.
Otherwise use the blue one.

Just for grins, you might try to get yourself a copy of a Loctite commercial catalogue. It is really educational. They make several thousand formulations, for everything from just barely holding tiny screws in place, to keeping jet aircraft wings on airliners.

Some of them are easily removed with heat from a hair-dryer, others are almost impervious to heat from anything.

Aah.. yes! The thread lock compounds are heat release! Bearing retainer is also heat releasing. Check the instructions first!

For all of you who recommend using "blue", as I stated before, from Loctite's own spec sheets, the one to use is #222MS. Loctite 222MS It is purple in color and according to my local industrial fastener supply house is formulated for screws smaller than 1/4" and is meant to be relatively easy to remove the screws. Now, I'm not saying "blue" which is #242 won't work; I'm just saying it isn't designed for small screws and is a LOT more trouble to take apart after it dries.