RE: Tack gluing?
Tack glueing is glueing pieces with a miniscule amount of glue(Cynoacralate glue)...just enough to hold the piece where you want it. After the piece is examined and it is decided that it is correct, the piece can be glued permanently with a different glue such as epoxy or alphatic resin, or even more cynoaclralte.
I hope this helps.