That's awesome Dave. I have seen TOP live on a couple of occasions and they are an awesome band.
And yes, I'd be wary of trying put any sort of chemical over the guitar and risk destroying the signatures. Plus some of them are on the plastic pick guard as well. I would just keep it behind glass.
And that was a good guitar to pick for the job. Even though I know it isn't for playing those cheap Squiers are very playable guitars. I could play a gig with one like that without a problem.