quote:What if i drilled access holes to flush out the inner rails and then sprayed
Yes, that has been done and is a good way to coat/protect from future rust.
Make sure you do a thorough rust search with a hammer and center punch. No, I am not joking. If there are paper thin areas, that punch will find them.
See this page at www.panterplace for the common rust areas.
http://panteraplace.com/page57.htm
Larry