Homebrew PCBs

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
>