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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
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On the subject of the "Blue Paint" from e-bay: I too am confusedby the presentation on the website. It says to dilute the materialwith an unidentified diluent. They don't seem to offer thatmaterial for sale, not do they tell us what it is. They do mentionthat a possible substitute is banana oil. I don't know about anyof the other members of this forum, but I don't keep banana oil instock because I have never encountered a squeaky banana. Hasanyone figured out what the solvent is?
With regard a spinner for applying photoresist, this website hassome info on building and using your own spinner. Much of theother material on the site, although interesting, is not new, andsome is out of date:http://www.tayloredge.com/reference/Electronics/PWB/pcb.html
Harvey