Auto body repair & detailing: underbody rustproofing, east coast canada, pep boys

Question
Recently purchased 2001 F250.  Truck is in great shape except significant rust on underbody.  Looked closely for structural damage and found none.  However, I am concerned that rust will continue to deteriorate the frame and suspension.  Heard that Ziebart or similar businesses can apply treatments that "seal" existing rust for about $300-$400.  Is this something that should be done?

Answer
Yes and Not necessarily Phil. If you live on the east coast/Canada, or places where there is a
significant amount of road salt used, I would say yes indeed.Other than that It 's really not
a must in MY opinion. Your f-250 frame and suspension is without a doubt, the strongest,best
built , and most resilient chassis on the road today even without the Ziebart.
Hey, You could do it yourself. NAPA/PEP-BOYS/AUTO ZONE #3M ONLY Rubberized HD Undercoating.
You would need about 6 cans for two even applications.
                                                         Hope this helps, Bill