Homebrew PCBs

DJ Delorie wrote:
>  
> 
> 
> I have a UV box with 99 LEDs, 395nm. Regular dry film takes about 5
> minutes exposure; what would that work out to with your ink? Does
> your ink come in spray cans? I think a spray-on ink would work well
> with our existing photomask setups.
> 

Hi, I have both a homemade 395nm LED light box and a basic commerical UV 
BL tube exposure box. Using LED exposure, my photoresist dry film takes 
70 seconds, while the LPISM doesn't even properly cure at 30 minutes.
 From limited experiments, the exposure period from UV BL tubes takes 
about 2~4 minutes for the LPISM. So my conclusion is LED's don't work on 
photoimagable solder masks.


Adam