Abstract: A device for applying a substantially uniform thickness of a spreadable coating on a substantially planar surface has a handle, a roller attached to the handle, and a spacer on the outer peripheral surface of the roller for engaging the surface to be coated. The spacer defines an arc of at least about 360.degree. around the outer peripheral surface of the roller for maintaining the outer peripheral surface of the roller both in communication with and spaced from the surface to be coated at a distance corresponding to the radial thickness of the spacer means during travel of the roller over the surface to be coated. In one embodiment, the spacer is a filament helically wound about the outer peripheral surface of the roller. The filament is releasably mounted to the roller and has a substantially uniform radial thickness. Also disclosed are methods for making and using the device of this invention.

Abstract: A method and composition for providing a polymeric membrane in situ for isolating vessels which hold hazardous liquid materials. A liquid polymer composition is applied to at least one of the surfaces defining the area which is to hold the liquid hazardous material. Upon cure, a seamless bladder-like membrane is formed which adheres to the surface, and which can be removed by physically peeling from the surface to which it has been applied. The membrane possesses a unique combination of properties which are substantially maintained while in contact with the hazardous material. The polymeric membrane provides, for an extended period of time, an impermeable barrier which acts as a secondary sealant and prevents the spread, deposition, or migration of contaminants.