I did ten before first sanding and still went through. I did however sand with water and not TO. Should have done TO - was too impatient and this happened. Should have just mildly level it and not try to achieve totally flat surface. Or maybe I was too rough with pressure. Whatever... now it's five more and then just the polishing compound as it's abrasive as well.

Frustrated and pissed off at myself for cutting corners right now...