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I'd say yes to removing the layer of spray-on-crap. I use my tumbler mostly to remove all the dirt and stuff from items I find in the ground with my metal detector. It often removes the paint as well, which is OK. I only put in things with paint that I don't care if they retain paint. This is often achieved with juat a couple of hours in the tumbler using aquarium gravel for slurry.
I have not actually done rocks, but have read about it. See if your town has a lapidary club. The club will have a ton of info, and samples to look at, or search on google for lapidary.
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