I recently purchased a 2007 FJ cruiser up here in the north where we use lots of salt. The only issue I noticed with this vehicle (and about half of the FJs I looked at) was rust developing along the welds in the frame.
What would be a good approach to getting control of this problem? Make that a practical approach, I am not going to take the body off the frame and have it sand blasted and powder coated.
Would it be reasonable to have it undercoated or treated in some way?
I know that some undercoating is actually worse because it traps moisture and salt against the metal, is there a good option?