A DIY finishing plaster should be applied to the undercoat before the latter is completely dry. It can also be applied directly to plasterboard and to an existing plaster surface, provided this is roughened slightly (all paint and paper should be removed). Mix up the plaster finish if necessary with clean water as for undercoat.
Application methods vary for DIY finishing plasters. Some are applied in the same way as DIY plaster undercoat (with a plasterer's trowel) in two layers (1mm followed by 2mm), whilst others are applied with a paint brush (7) and then smoothed with the plastic spreader supplied (8). Check the instructions for your plaster.
If you have used a plasterer's trowel to apply the plaster, give it a final smoothing with the trowel after it has started to harden. Dampen the surface with water as you do this - a simple spray bottle will help to apply this.
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