Banana oil is slang for amyl acetate or isoamyl acetate because they smell like bananas. Amyl acetate is used in lacquer thinners. Lacquer thinner, acetone and alcohols will thin this resist. Alcohol is probably not a good idea due to the amount of water in most available alcohols.
I have spin coated a few small (2" x 3") boards so it can be done. However it is not quite as simple to achieve a satisfactory result as some of the videos of spin coating you may see on the internet.
Craig
---In Homebrew_PCBs@yahoogroups.com, <hrconsult@...> wrote :
....
On the subject of the "Blue Paint" from e-bay: I too am confused
by the presentation on the website. It says to dilute the material
with an unidentified diluent. They don't seem to offer that
material for sale, not do they tell us what it is. They do mention
that a possible substitute is banana oil. I don't know about any
of the other members of this forum, but I don't keep banana oil in
stock because I have never encountered a squeaky banana. Has
anyone figured out what the solvent is?
With regard a spinner for applying photoresist, this website has some info on building and using your own spinner. Much of the other material on the site, although interesting, is not new, and some is out of date: http://www.tayloredge.com/reference/Electronics/PWB/pcb.html
Harvey