Abstract: A sealing means for use with a container, which, in one embodiment, comprises a sealing portion and a handle attached to the sealing portion. The sealing portion is capable of covering a surface of a substance within a container so as to prevent the formation of a skin on the surface of the substance. In a preferred embodiment, the sealing portion comprises a flexible membrane or diaphragm with an O-ring at the circumference of the diaphragm. The O-ring is in sealing engagement with the interior wall of the container. The handle portion may also be made of a flexible material and comprise a shaft portion and at least one tab portion extending from the shaft portion. Alternatively, there may be a loop attached to the handle portion. The sealing means may thus be able to fit entirely within a container and need not be fastened to the container.