We followed Jerry Cloemenzi?s use of special tools during the professional installation of real plaster crown moldings.
Of note: he used a framing hammer to punch holes in the drywall right where his plaster was going to glue the molding to the wall. That gave him great toothing into the wall.
Then he used a whole range of simple scrapers to fill and level the joints between pieces of molding and to clean off all the excess plaster from the installation.
The one tool that unfortunately got left out in the editing was his index finger. I saw him constantly using this both to apply little dabs of plaster, and to check the quality of the joints he had just scraped smooth.
Omega Modern Mouldings from Woodbridge, Ontario were carrying out this job.