Hi!
First of all the OS LA engine is a ABN engine and such engines must be run-in at fairly high rpm....say at 8000-12000 rpm using a 10x6 prop.
Loctite on the treads....??! You most be joking!
You don't have to put anything on the treads!! Just tork the nut down firmly....and why use a wood prop ?? Get a APC Gray plastic instead ..it will perform much better than an old top-Flite or Zinger wood prop.
If you are a newcomer using the OS .40 in a high winged trainer I would definitely recommend a 11x6 APC prop as this prop will give you better flight performance...not perhaps higher speed or better trust....but better, calmer ,more relaxed flying behavior of your airplane.

Regards!
Jan K
Sweden