This approach initially appears attractive, but if you need to turnaround and etch boards quickly, or need double sided boards done as I find common, then hot lamination is the way to go.https://hackaday.io/project/7938-pcb-smt-maker-lab-homehttps://hackaday.io/project/3363-apache-al13p-laminator-one-pass-pcb-toner-xfer