I have installed much crown moulding, and these are my tips for mdf.
I go around and place a small piece of painters tape over each stud, so you know where to nail. smaller crowns can be nailed into the top plate, but that tales a long nail.
45 deg bevel on the splices for sure.
I cut the joint such that the piece overlapping the other is right over a stud about 1" before from the joint. that way you can nail the "top" piece well, and down hard over the joint. I don't nail through both, can split them.
dry fit before nailing. I place the flat against the wall a couple inches below the ceiling - then (keeping it flat against the wall) slide it up to touch the ceiling then nail.
you can pin up with pneumatic, but hand drive 8d finish will hold in place so much better.
I use painters putty for nail holes and any open joints, placed in with small screwdriver.
I like to install primed and painted crown. then a top coat over the nail putty.
coping - another discussion.
SORRY more than a glue answer - ignore at will!
Last edited by TimPa; 04-30-2019 at 02:24 PM.