Is it worth undercoating a new Yaris?

[blacksan]

We always undercoated new cars when I was a kid to protect against corrosion. With new manufacturing techniques/metal finishes it is not necessary. It will dampen interior noise to some degree in certain applications, but you also risk trapping moisture causing moisture. If you want to darken the inner fender well I would be more prone to a thorough cleaning and flat black paint application myself.