Paint tray liner reducing greenhouse gas emissions and plastic waste

A paint tray and liner kit, comprising:

• a paint tray having a female receptacle;
• a liner in an uninverted state having an initially-interior surface and an initially-exterior surface opposite the initially-interior surface,
• the initially-interior surface defining an initially-interior paint well and initially-interior ribs,
• the initially-exterior surface defining a male curvature removably received in the female receptacle of the paint tray;
• and
• wherein:
• the initially-exterior surface defines initially-exterior ribs adjacent to the initially-interior ribs, and
• the liner is sufficiently flexible such that the initially-interior paint well is invertible from the uninverted state into an inverted state without perforating the liner by application of hand force to the initially-exterior surface;
• and
• wherein in the inverted state:
• the initially-interior surface is an exterior surface defining a curvature that is substantially the same as the male curvature that was defined by the initially-interior surface;
• and
• the initially-exterior surface is an interior surface defining a new paint well.