Homebrew PCBs

I cured the board the same way you did by heating a aluminum block. I tried the home oven but that
took too much time but was very good for keeping a constant temp. I cleaned the board only with a
gray synthetic woven sanding pad and acetone. I made sure that I scrubbed hard with the acetone to
take off all black residue that shows up. From the pad or the copper I'm not sure but I did get it
clean. There are no wetting agents on the board. I first used the hot air gun to make sure that
all the acetone was evaporated and that lead to heating it up more for the ink. This did make the
most improvement for me.