Blue liner is good but it becomes messy quickly so you really need to change it every three days or so. Duotac is very strong and comes in 5 inch lengths and does not break down but it is slightly thicker and not really suited to the hairline unless maybe you wear a comb down style. I recently tried the new Vapon Topstick serated edge tape across the front and it is pretty undetectable, but very narrow and a bit shiny and doesn't seem to hold onto the lace too strongly. May work better with a little white glue applied over it, the tape between the glue and the skin makes the glue stick for longer as there's no sweat getting into it; tape seems to be more resistant to sweat than glue does.