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.