There is a rather large file on this subject and the answers range all over the place but from someone that has built a few - keep it simple.
Coat all surfaces of the MDF with Shellac until it quits soaking it up - removes issue of moisture, swelling buckling, white or yellow glue
let dry and then get a spray can of contact adhesive and spray the mating MDF sides, let dry and carefully mate. Do the same for the top coat (Formica if applicable), aluminum, steel sheet or etc. non-water based, fast dry, no open cans of Toluene and Acetone fumigating the place
make your cuts and when proper coat MDF, including the insert area, with more shellac. Forget about the wax
Do the rest as you require and good luck - Baker
Last edited by rwbaker; 04-17-2014 at 08:15 AM.