Never known anything that could withstand cellulose thinners. I've not used it on guitars but was using it in a specialist spray shop. Eats the paint off the guns, melts rubber and plastic, destroys your skin after its eaten your gloves. Could be worth a go, but be careful!
You can also get sanding discs for small angle grinders, would shift the paint but it would be very easy to sand chunks out of the body.