You need to wax the aluminum prior to seating the beams. Almost any wax will do. Wax the inside of the beam bolt holes too because if any creeps inside there it can be a pain later on.

The hulls have gelcoat over the polyester resin, just sand the beam sockets lightly and smooth, clean with some acetone and the epoxy will stick fine.

I prefer to use epoxy, I've been told the class rules specify only gel coat may be used so if you're worried about that use gel coat.

On the infusion, make sure you don't end up with any epoxy in the gap between the the top front of the beam and the hull. It will make it impossible to get the beam out.

If you do all this it will require a very slight nudge to get the beams off but hardly any more effort than before you seated them.