Abstract: A retainer for immobilizing a bucket containing a liquid material, such as paint or other relatively viscous liquids, during mixing the material or to prevent accidental tipping of the bucket, is formed with a ring-like socket within which the bucket is positioned. Laterally-extending wings are formed on the socket. The user stands upon the wings to hold the socket against the ground-supporting surface upon which the socket is supported so as to prevent rotational or other movement of the socket and, consequently, movement of the bucket. The socket is formed of a generally cylindrically-shaped, vertically-axised wall which is tapered inwardly from its upper edge to its lower edge at a sufficient slope to radially inwardly frictionally grip and temporarily lock the bucket within the socket.