Factory Ford flywheel bolts are grade 8 , self locking and self sealing. There is no reason to use a sealant or thread locker. When torqued to 75 ft lbs they will not leak or loosen up. I can not say the same for aftermarket bolts. "IF" your bolts are weeping , you will see "tracks" because of the clutch dust clinging to the oil. Check the input seal or rear main seal too which is more often the cause.
'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
'68.5 R code GT fastback
'67 Ranchero 408W -427 glass hood
'78 F350 "Oleynik" car hauler
Ford Experimental parts collector