I am using a spray on photoresist to sensitize my PCBs. I
followed your instructions on development. I have made my own developer and can see my
circuit on the board, I then attempt to etch this board but nothing happens. No etching
orrurs. I am using Ferric Chloride as a solution. The etchant works because on an simple
untreated clad board so I do not beleive that this is the problem. Do you have any idea what is going wrong with my
process