I'm still on the fence undecided. For my current sports car I didn't put any on. there were 2 options, high spots $2800 or for a complete package at +- $5800 and people have told me to only put it on if the paint is in pristine condition and probably too late for me.
I've read both sides in many threads that stuff saved the day and I've seen other threads, it didn't do what it claimed or it peeled and now I see it collects dirt on the edges.
As far as carfax, isn't that reserved solely for accidents? Will the body shop declare to them you decided to repaint the front bumper because of many years of rock chips? This is purely speculation but if we based solely on the prices of Gallardos, Huracans would naturally depreciate to 100K-150K CAD in 10 years anyway. So what's the rebate on on a 100K car because you repainted the front bumper?