Use the base coat plaster product to plaster the walls and ceilings joints, and then wait until the base coat plaster dries. The optimum wait time is approximately 12 hours. However, waiting that long is not essential. You may begin plastering between 40 to 90 minutes, as soon as the base coat plaster hardens. During the final plaster coat, the veneer plaster should not be mixed more then 1 bag ½ per plasterer. It will dry fast and can be very hard to work with. A professional plasterer will need some time to complete the skim coating with one smooth coat finish.
The veneer plaster work does not have to be sanded before painting!