Joseph K,
I admire your very careful determination to avoid any possible issue with fumes. I personally will stick with my view that if we are only talking about small repairs (not crazy full paint jobs as I have seen done inside a gas grill), I don't think there is any real risk as long as you do a couple good burn-offs. But, being careful gives comfort, whereas my view I suppose can leave you still wondering. The people who have painted the entire inside of their gas grill with high heat paint don't seem to wind up at the hospital. I guess that doesn't rule out more insidious longer-term effects, though.