I have never had a full hairline, and about 8 years ago I tried getting that part of my hairline microbladed but they did a terrible job. I figured out I could fill it in with a makeup brush and black shadow and it really makes my hair look fuller! I use the dual sided brush I got with my Anastasia palette but I do recommend a fluffy brush and a more tiny denser brush - the fluffy brush to blend closer to the hairline and the smaller brush to darken the deeper part.