The ornamental design for a fingertipapplicator, as shown.
FIG. 1 is a right side perspective view of a finger tip applicator showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a front perspective view thereof; and,
FIG. 5 is a is a left side view thereof with the right side view being a mirror image thereof.
The broken line showing of parts of the drawings is included for the purpose of illustrating use and environment and forms no part of the claimed design.