Homebrew PCBs

If it is dry film resists then you need a strong alkaline like sodium 
hydroxide. Exposed the remaining resists and then soak in say 5% 
solution for few minutes and it should just 'lift' off of copper.

jackafaz wrote:

>Hi,
>
>     I have some old PCB boards that were exposed but never eched. I 
>need to find something to remove the old resist. I have tried Mineral 
>Spirits, Lacquer Thinner, Acetone, Gasoline and nothing touches it. I 
>would sure appreciate any ideas. I have not been able to locate a 
>source for a "remover" though I know it is made. Also, is there a 
>source in the US for Positive Resist in spray cans? I must be 
>searching in the wrong place.
>
>Thanks - Jack
>
>
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