People are starting to take it serious, IE --NADA average age of vehicles on roads are over 11 years, plus the average length of payments is approaching 7 years. Corrosion warranty by manufacturers may vary from 12 months to ?=4 years? The warranties are only to cover "manufacturering defects", not enviormental created corrosion.
Another concern is the buying public believes that "under coating" is protection from corrosion,when in reality, most such products in a couple of years may actually promote serious corrosion due to the chemical make up them. They "dry out" and crack, which then allows the corrosives of salt and mag chloride to get between the cracked under coating and hold them and moisture against the metals. The correct industry term for this is "pocketing". Only a product that meets or exceeds the SAE and ASTM standards for rust inhibitors/preventatives actually protects the hem flanges, seams and "interior cavities of any vehicle. 12 years ago I was the main author of the required use of approved such products for corrosion protection as published by I-CAR.