Taken an example from the sea the oil rigs have implemented this form of rust deferral but the rig is totally underwater where as the car is not. I've 'toyed' with the product that CT sells and though it is on sales a few times a year I'm not convinced it works 100%. I just oil spray my vehicle and 12 years later its good as new as the day I brought the car home!
'05 GMC Sierra SLT Z71 CCSB 4x4
'02 Regal LS
'00 740i Sport