i had to cut out 2 small bad bits out my rails, just make sure you cut right back to good metal
my cars been off the road now well over 1 year but thats only coz not having time to do it 3 kids and stuff lol but it dont take long i was lucky mine was ver good under there before i started it was getting off all the wax oil which pissed me off
mines in the restro bit from the start may be on page 2 now

mark