I absolutely adore working with Brisa but my technique is a little different and it produces a central vertical apex as opposed to just a thicker area in zone 2. A central vertical apex makes a stronger better balanced and more beautiful enhancement in my humble opinion. Here is how I do it.
I pick up a large enough amount of Brisa gel on my brush to place a 'log' (for want of a better word :lol
right down the centre of the nail from eponychium to the free edge. Using that log as my reservoir, I tease the gel from the centre to the side wall on the left working my way right down to the free edge ... Then I do the same thing on the right side. This gives the nail a beautiful strong 'backbone' and a beautiful curvature all in one go. No need to 'place' an apex as the backbone is a solid apex which never gets displaced by the growth of the nail. I build this type of apex using all systems.