Absolutely reapply. After carding I use a cotton ball to apply the browning solution in long continuous strokes along each barrel flat. I put a wooden plug in the bore and use that as a handle so as to not touch the barrel with bare hands. The surface should be wet but without puddling.
You should remove a full stock pinned rifle barrel to check for rust etc. Every 25-30 years or so...
Alot depends on usage and cleaning routines. Do plenty of research on preservation if you want it to last a good long time.
Love new shop tools!! Kinda like guns never to many.
just not enough room in the shop!
...or guitars, pedals and amps - same thing
'That evil Scot's woman I'm addicted to.' What a beautiful line, Deerstalkert. Lovingjust not enough room in the shop!
today i started my first attempt at carving. disregard the blood stains on the keys.
after getting weak from blood loss I decided it would be much healthier to sharpen my carving tools. (i am a collector of tools, not a carver).
after i got my carving tools as sharp as a harpy's tongue, i noticed my inletting chisels quietly sobbing in their rack, due to lack of attention.
once they were restored to joyous harmony, i said "why not!" and sharpened my draw knives and spoke shaves!
about the time i had them smiling, that evil Scot's woman i am addicted to showed up with her kitchen knives.
can barely move my arms.
wonder if i could manage to load my .45 and shoot this months postal target.
. And brave too, because now, she's got sharp knives! 
on a good note, I never seem to get tired of looking at them or reading about them, but eventually I’ll have to make a decision.
I remove mine once a year to check for rust. I put a coat of lithium grease on the flats and reinstall it.
