While I think you were referring to a different application, it’s my understanding that thread lock should not be used on keel bolts, rather anti seize. The bolts themselves can minorly stretch and need to be re-torqued periodically.
Here is what Catalina Direct has on this topic explaining why\where the LocTite is used and when\where to apply MareLube (see bolded areas):
"Includes nuts and washers, both in type 316 stainless steel. This stainless alloy is more corrosion resistant than the standard type 304 stainless fasteners that were used in the original boat. We also include a special formulation of LocTite that no longer requires a primer when both mating surfaces are stainless steel as was necessary in the past.
LocTite prevents the nuts from backing off. But perhaps what is more important, they will also prevent the nut from seizing to the stud over time
. In spite of the LocTite, we replace our keel nuts every few years to insure they don't seize to the studs.
Thread size: 3/4"-10
ID of washer: 3/4"
OD of washer: 1-7/8"
Freeze Off penetrating lubricant to loosen existing nuts. Specially formulated to dissolve rust and corrosion.
Stainless steel brush wheel. Use with hand drill remove rust from keel bolts.
Rethreading die, 3/4"-10. Uses 1-7/16" socket, not included.
MareLube TEF to prevent seizing, galling, and corrosion of new nuts. Coat washers before installing and coat nuts and exposed threads once installation is complete
LocTite to prevent the nuts from backing off and from seizing over time.
Here is the link in case some missed it: https://www.catalinadirect.com/index...-c-36-c-38.cfm