This instruction is about how to apply solder mask to PCBs. It is assumes you already have traces on a PCB (regardless of etched or milled) but no holes yet, like figure 1. You also need artwork (black printout to transparent foil) containing only pads and vias. You can achieve this by selecting “tStop” (layer 29) or “bStop” (layer 30) for top and bottom respectively. Make sure to select a solid fillstyle (see figure 2).
The room you are working in has to been protected from of UV lights, e.g. use 05 EG 027. It has special lamps and no windows (avoiding sunlight).