have 100k on ford expediton 01...have been battling hood corrosion forever on this rig...also doors rusting out from bottom up (gap seal trapped mositure I beleive).......was going to keep it forever? what can be done to fix and preserve..........notice most others 2001 thru 05 are having same issue

 

This is the 2007 and up forums, but google Por 15. Works.