http://www.diyplastering.co.uk Learn how to skim - the basic diy skills needed for skimming a wall. 2 coats of finish plaster are applied and 'trowelled' to give a flat, smooth finish. This finish coat is just one aspect of plastering - if the plaster backing coat is flat, the finish coat of skim is fairly straightforward. This video is a very quick guide to the art of plastering.