Don’t rightly know but using something like a Kilz primer or a waterproof paint might be your best method of sealing in stray fibers.You sound like quite the handy woman - could have used you around here lately - Andy fixed the ceiling in the tent trailer and at first I was concerned but it looks like he did a half decent job! (Will wonders never cease lol)
One question - if you use fiberglass ceiling tiles then paint over them will that seal in any stray fibers? I wouldn't want to breathe in fiberglass while sleeping in there.
DiO'Bolic - you could chime in here too if you want, since you seem to know a lot about building materials and supplies.
Thanks!