Homebrew PCBs

FeCl is a big stainer
> but keeps well. Any info on SP like shelflife, disposal issues,
> staining, smell?

No smell, no staining, shelflife is 2 weeks. You cannot reuse if like FeCl.
Heating it tends to make it work much better.

Here is a link to disposal.
http://www.kepro.com/fmc4.htm

Thanks
Ron