A flexible barrier sleeve device and method to temporarily store a wet paint roller between uses, to avoid cleanups between successive applications of paint, or other roller-applied coatings. The flexible barrier sleeve has combined water- and solvent-barrier properties. A twist-tie can provide a closure and sealing means, and a stiffening strip disposed along the outer lip of the sleeve facilitates forming an opening into the sleeve for ease of loading of the wet paint roller. The sleeve material has barrier properties sufficient to keep both water and organic solvents (“paint diluents”) inside the closed and sealed barrier sleeve. The twist-tie provides a vapor-resistant seal, to minimize the loss of water and organic solvents from inside the sleeve through the sealed opening. The combined barrier properties of the sleeve material and vapor-resistant seal prevent the wet paint from drying on the enclosed roller, and allows the paint roller to be later removed in a condition ready for the next use. The barrier sleeve can be used to store the wet paint roller on or off the roller frame.