Homebrew PCBs

palplr wrote:
> Can any one say what are the easily avaliable photo checmicals to 
> spray or paint on the bare pcb for either positive or negative print.
>  
I don't think you can easily formulate our own liquid photoresists that 
perform as today's commercial photoresists. Exact ingredients and 
manufacture process would be a trade secret, and to get close you have 
to be expert in that field of chemistry. Because you ask the question I 
assume you have very limited knowledge of chemistry just as I do. Your 
best bet is to study chemistry and search the patent databases.

Good luck,

Adam