Once the tracks are printed on the coper, you can etch the copper with your etchant solution, then clean the copper with acetone.

A small circuit to hold a SOIC component.

There are many tutorials on internet on how to perform this specific phase of the process, so I am not going to add some more here…

I used below the etch resist pen from Shaedtler, 0.6mm. ( i believe there is also a  Shaedtler 0.4mm , but i did not tried it)

The tracks are not perfect, but are working. Some better results would be obtained with the insolation method.