On 15/02/13 02:22, Leon Heller wrote:
> On 14/02/2013 14:34, Mitch Davis wrote:
>> On Fri, Feb 15, 2013 at 12:32 AM, Leon Heller leon355@...
>> <mailto:leon355%40btinternet.com>> wrote:
>> >
>> > Photo-resist goes off after a few months, which could cause a problem
>> > with old stock.
>>
>> When making PCBs at home, I use Kinsten pre-sensitised board. I
>> haven't had a problem with photoresist going off, because I seal the
>> bag tight after I've cut off as much as I need, and store it in a
>> lightproof box. I haven't had luck with developer though. It seems
>> that once it's made up into a liquid, it doesn't keep for more than a
>> few weeks.
>
> The NaOH developer I use (2 tsps per litre) lasts indefinitely.
I use 10g/Lt NaOH as ∗stripper∗. What do you strip with?
I use Na2CO3 sodium carbonate as developer.