Installation instructions for Plaster Crown Molding and Cornice:
1) Pre drill and countersink holes for screws near top and wall parts; approximately one screw for every ft. of cornice/crown molding
2) Apply liquid nail glue on the back of crown molding near ceiling and wall edges, but not too close
3) Put crown molding up against the wall and drill the screws in. wipe off excess glue of the edges if necessary
Pointing up joints:
4) Combine a small amount of plaster with water into a small cup so that it is about buttery substance (amount of plaster determines thickness)
5) Using a knife like tool, apply plaster to the joints of crown molding.
6) Using a wet brush (kept in a water bottle) brush excess plaster off to the side and onto the brush which you then rinse in a water bottle.
The seam is gone !