I am just going off the spec sheets for shelf life. I am not sure what
happens as the resist starts getting old. I am sure the resist does
not instantly fail to work after a year, but it may become more
difficult to work with. It may not expose as well or may not develop
as easily.
I do not want to be selling something to people that may not perform
as expected. That is why I do not plan to sell the resist after I have
had it for a year.
--- In
Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@...>
wrote:
>
> javaguy11111 wrote:
>
> > The biggest problem with the photoresist is the limited shelf life.
> > There is a time constraint to move the inventory.
>
> Interesting. I have not noticed any degradation over the 4 years I've
> owned my dry film negative active photoresist. I keep my dry film roll
> permanently stored at room temperature in a varnished wooden box fitted
> with a hinged lid and foam seal. It could have water or other solvent
> that evaporates and cause problems. There is a small odour when I open
> the box, so something is escaping, but its obviously insignificant.
>
> Of course this doesn't mean photoresists have infinite shelf life. Some
> just may be longer than others. I suppose storing it in a fridge would
> extend it.
>
> Adam
>