Plastering is a common word in the building industry. It is normal to hear people inquiring for plastering and other skimming services. The two words can be confusing. Some think that they mean the same thing and others think they are two different things. But what is the truth behind these two services? Below are all that you need to know about plastering and skimming, this includes the differences too. Before you know what plastering is, it will be wiser to understand what plaster is. Plaster is a smooth combination of water, cement, sand and lime(optional).