Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I pre-heat the etchant (in it's bottle) in a few inches of hot water;
it doesn't have to be ∗that∗ hot. However, I don't just soak the
board in etchant, I use a sponge to wipe the etchant across the board.
I did a 3"x3" board today (er, 1 or 2 oz) in just a few minutes. The
mechanical action of the sponge really speeds up the process, but you
need more than just toner - the sponge trick is a Pulsar trick that
works with their green TRF, which seals and protects the toner.