Conformal coating with a silk screen never worked well for me. There were always visible creases and uniformity issues.

I also want to have a consistent layer thickness because the intention is to start with a white layer and on top of that a green layer. I will use a laser engraver to remove part of the green layer to expose white again to make the silkscreen layer.

A spincoater ensures the coating is always exactly the same which is good for laser ablation.