FIG. 1 is a front perspective view of a paint applicator device; FIG. 2 is a right side elevational view, with mirror of FIG. 1; FIG. 3 is a front elevational view of FIG. 1; FIG. 4 is a rear elevational view of FIG. 1; FIG. 5 is a top plan view of FIG. 1; and, FIG. 6 is a bottom plan view of FIG. 1. The broken line showing is included for the purpose of illustrating and forms no part of the claimed design.