Developed 2AND/2XOR module for carry-chain version of Adder. Just need to etch pcb's for it.

Failed first attempt of protection solder mask applying. I expected this.

I did this procedure long time ago last time.

Unfortunately my oven handles temperature with very big difference between the top and the bottom of oven. As a result - when two thirds of plate were successfully opened from mask top one third wasn't. Need to add little metal fan into oven for active convection.

Move out mask from all plates which I tried to do.

If second attempt would be failed too I will just milled boards and solder them without the mask.