Homebrew PCBs

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