Rust, Paint Damage, and After Market Coatings

Hello,

I just purchased a 2015 Prius Five (Liftback, not the Prius V), and I'm curious if an after market coating like the Ziebart Diamond Gloss is worth it. I plan to keep the car for 20 years or more, and I'm certain that the factory clear coating and under body rust protection won't last that long. After that long, I don't think there's any coating in existence which will hold up to nature. So I'm debating on whether to get this coating, and whether it's better than something I could hand apply. At the moment I'm leaning toward getting those coatings applied in maybe ten years, because I think that applying a new protective coating on top of the factory applied coatings is overkill. I greatly appreciate your thoughts on the matter!

James

 

Also, I should say the coatings I'm looking at are applied by Ziebart -- anti-rust applied to the underbody and inside of the panels, and underbody anti sound barrier, and a 'diamond gloss' paint coating applied free every year.