This is a common problem I see with us guys
I've got some rust on the underneath of my hatch as well
My fix will be
A fiberglass hatch,yup I've thought about taking the old,flaky rust off,prepare it for paint,blah ,blah blah,but then I thought to myself "yeah in 2 years it could possibly come back again,so instead I'm gonna replace the hatch with a fiberglass replacement and NEVER have to worry about this again
