Abstract: A plaster's tool having a flexible blade which has a handle coupled to a member for dynamically folding the blade so that the tool may be manipulated and the blade dynamically folded by a person holding the handle to assume the correct angular configuration for laying a plaster bead along the outside corner formed by the juncture of two surfaces meeting at an angle of 180 degrees or greater. Another important feature of the tool embodiments is the fact that the blade readily assumes a flat, planar configuration providing easier loading of plaster onto the tool and the transfer of the plaster on the flat blade to the work surface.