Ok, the spray-onto method sounds good. I can just heat a resivoir and pump that into some tubes aimed at the board.
I have to play some fun games to see how many months of failed attempts it will take me to print inkjet resist a pcb pattern. I thought to mix RAIN-X into the UV pigment so the etch pattern would repel chloride like it does rainwater on winshield.
I should fill my winshield fluid with ferric chloride and aim those nozzles to spray my appreciation on the back of every car that quickly cuts me off, and hesitate while texting & driving.