I told you how to get it done right in my first comment. HIRE A FUCKING PROFESSIONAL cuz you don't know what you're doing.Thanks for your contribution to the thread. Your input will be invaluable to OP when he decides to take on this project.
You've made several claims in this thread and yet you have failed to explain the procedures on how to actually do a single one.
But you forgot more about crown molding than anyone else ever knew.....