I think what he means is repairing rust is only masking the inevitable. If an area of a car is prone to rust it will happen again depending on driving conditions, how often you drive your car under certain driving conditions, and how well you take care of your car. He would feel more comfortable tearing the car down to check every possible nook and cranny and prevent rust all together.
And.... considering he is in Canada... Well conditions can be pretty ruff sometimes.
And.... considering he is in Canada... Well conditions can be pretty ruff sometimes.