I don't know about transparent colour in a spray can, but I have been using Dupli-color on top of SCA filler-primer with good results so far. I plan to finish with SCA clear acrylic. All of which were recommended on this forum. This is for a solid body colour though, so not that useful for you. I mention it just in case, as all are readily available from SCA stores.
For the neck finish, I will be using Cabothane Satin Clear in a can. That or the gloss might work well over a compatible stain, but I can't give any advice about that, sorry. Once again, readily available from the Big Green Shed that shall remain nameless.
For much better advice, I suggest trawling through the build diaries. A lot of threads mention the finish materials and techniques along with photos of the results.
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