hi pal
today i used a layout and tried to make a pcb
i placed the transparent film onto the presensitzied pcb
then
did what the manual said
then i developed it before i etched it
i realized that i did not use a piece of glass on top of the transparent film
some circuits were broken
after i etched it
i saw some green stuff on the pcb
my question is do i have to wait til the errosive liquid remove the green paint
or do i have to rub the green stuff away with a toothbrush
coz i am thinking if i let the errosive liquid remove the green paint
maybe some circuits will be etched away too
Thanks