> 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.
Always, always use somekind of protection for eched boards. I use
Multicore PC52 spray, maybe this is no longer in production!?
Drilling after etching is the method for us homebrewers to use, as we
cannot cover up the pre-drilled holes and therefor ruin our pads in
etching. Always use sharp carbide drills.
Bengt