Homebrew PCBs

On Tue, 13 Jan 2004 21:42:22 -0000, bsjoelund <tecnoconsult@...> 
wrote:

>> It may also be not so good to stock a huge amount of presensitzed,
> because
>> of shelf-life didn't consider this...
>
> Dont purchase presensitized material more than for 6 months usage, keep 
> material cool/dry/dark! I have had bad experience with unsensitive 
> material that was old!. Always use the same supplier so you dont have to 
> *recalibrate* your process, as long as they have the same 
> supplier/manufacturer.
>

well, my experience is that is is not that bad.
i got some boards for free a few years ago.
they were at least 3 years old (room temperature stored), the only thing i 
could notice was
the black cover layer did come of a bit hard.
i used "pausklar" which is a light oil to solve it and rub it off.
but the board worked fine...

as said, i wouldn't stock presensitized board more than necessary.
and it is hard to get it cheap in large quantities anyways so there is no 
reason...

st