Some food for thought:

In three different sizes of 3W engines used on some unmanned stuff, both singles and twins, with all the aircraft flying for numerous continuous hours at a time, no Locktite has been used on the prop bolts. That's for both plastic and wood props. There has never been a need evidenced. All the bolts and/or nuts are properly torqued to the manufacturers suggested rating. BTW, that's about 40 inch pounds if I recall correctly.

If you're using a wood prop as mentioned in an earlier post it will need to be re-tightened periodically and the use of Locktite will make that difficult. You would also have the need to chase the old Locktite out of the threads each time you re-tightened the bolts and reapply the stuff all over again. If the threads are not as clean as possible Locktite will not bond all that well anyway.

Use it if you want, but I can't see the benefit.