It shouldn't feel slippery, it might need further buffing to remove all residue.
To completely remove it the easiest way is to get some Prepwash wax and grease remover and clean it with that. This is what body shops use to remove polish and any other contaminants before respraying. You'll probably want to polish again with something tho as it will look a bit dull after. Also, it's generally very safe for most paints, but you should always test new products in an inconspicuous place first.
I really wouldn't be worried about it. In an automotive setting you are dealing with large surface areas, nooks and crannies that are hard to get at and a vast array of chemicals. Silicone is avoided in body shops as nothing sticks to it (Paint/primer/etch primer etc etc) so missing it in prep can be an expensive exercise, especially on something like a show car.
Most cars, especially older ones usually have some silicone sealer used somewhere(around the windscreen for instance) so it's just a matter of being careful when cleaning and prepping those areas.
For a guitar, even if you do refinish, its such a small area to cover and you'll be stripping back the paint that it's sitting on, I just don't see it being an issue.
I did go and do some reading and it does seem that Scratch X is not preferred in a body shop setting. It's definitely a different formulation to most other polishes and compounds I've used, so perhaps there is just a distrust based on that. I've used it a lot and have had no issues at all.
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