Surfacing device

The invention relates to a surfacing device for making substantially plane the top surface of a viscous material contained in a receptacle, and it also relates to a surfacing method using such a device. The device comprises a moving assembly () designed to be placed in an operating position in which said assembly () is over the opening () of a receptacle () filled with a viscous material, first motor means () and a first guide system () serve to impart vertical translation movement to said assembly () relative to said receptacle (), and variable-speed, second motor means () and a second guide system () serve to impart rotary motion to a moving subassembly () belonging to said assembly (). Said subassembly () has a vertical shaft whose top portion () is secured to said second motor means (), and a rule () connected to the bottom portion () of said shaft, the length of the rule being substantially equal to the radius of said opening () and the rule having a bottom surface presenting a horizontal longitudinal portion designed to level the top surface () of the viscous material.