Dry-film Developing

Questions about:

1. In the Reference Stack you mention the importance of "breakpoints". I am not quite sure if I understand this. Please provide a brief explanation of this concept.
2. 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

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