On poly I have had success using clear Scotch tape with Blue Liner for the nape as Blue liner is a bitch to get off the poly. I recently used Red Liner to the poly and Blur Liner over it.

But NOW I use all lace and St-30 on sides Blur Liner in the bacK I do not line the whole edge. I use three 2" strips
One center one on left and right corners behind ears. front is no shine or glue.

I like the cap and would not go back to a partial. Blending is simply not an issue and I do leave some sideburns.