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Laser Etched DIY Soldermask?
Evening, everyone! 
Was wondering about something, and how you guys would recommend going about doing it. I'll be churning out a few more PCBs using an LPKF Protomat C60 mill in the near future for a sponsored project, and was wondering about opinions on soldermask. Little board mill works great for low-volume prototyping.
We'll be needing a handful of TSSOP packages and maybe a QFN if it absolutely can't be helped, and there are a few other places where a solder mask would be awfully helpful. I've got a Universal Laser Systems desktop laser engraver on hand, and was thinking that it would work pretty well to just dip a board in some sort of solder resist and selective burn it off; laser's only 30W or so. What's nice is that DipTrace (my preferred software by a long shot) will print any layer of the PCB straight to a printer, which is perfect since the VLS interfaces like a regular printer and so we'd just have to get the alignment perfect and let it fly.
Any recommendations for a good coating to try this out with that I can get in something less then a five gallon bucket? Am interested to see how well this works out.
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