1. Apply two coats of water based (paint + primer). Make sure you use paint w/ primer in it.
2. Install all your corners throughtout the room.
* (For Steps 2-3) Apply construction adhesive to back of molding. *
4.Measure the remaining areas and cut to fit.
5. Fill your vertical seams w/ sandable spackle.
6. Caulk your top and bottom horizontal seams.
Crown Molding Solutions offers inexpensive Flexible crown moldings, Foam crown moldings.