I used Meguiar’s Scratch out polish and found out later it contains silicone! I do not want silicone anywhere near any of my guitars. It wasn’t listed on the bottle, either.
I'm going to email Mequiar and see if they have an MSDS for the Scratch X. I've just used it on 2 guitars, but not keen on silicone either.

I know Sonic has much more experience than me with the auto refinishing, and I get I his point about prep, but I also know that once I've "finished" a guitar, it doesn't mean it's going to stay that way forever .

I've been known to refinish a finished guitar once or twice...