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

I purchased some of this stuff off ebay some time ago and I've just got
round to testing it. First up I had to find a thinner (what the seller
calls diluent) the suggestion was Banana Oil. I tried to source some
banana oil (Amyl Acetate) in New Zealand to no avail (I used to buy it
as a kid 50 -60 years ago for model aeroplanes) but I tracked down some
Pentyl Acetate but the supplier was out of stock. He suggested Ethyl
Acetate, N-Butyl Acetate or ISO Propyl Alcohol so I got some Ethyl
Acetate. It doesn't smell as nice as Banana Oil but it works. Next I
tried painting a board with a brush. It sorta worked but the covering
was uneven so I pulled out my El Cheapo Air Brush and tried that. Hey it
works and give a pretty impressive result. I do have one problem. If the
coating it too thick the developer doesn't remove all the exposed area
photoresist, however judicious use of caustic soda solution and cotton
buds fixed this.