Homebrew PCBs

> 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