In order to protect your newly poured concrete patio or freshly built wooden deck, it is important to have it sealed. A properly sealed patio or deck will hold up better and last longer under all types of weather conditions. It will also be protected against spills and stains. Sealants can be applied with a brush, roller or, in some instances, with a sprayer. To get professional results read and follow the instructions on the label of the can of sealant.