This one drives me nuts. It’s that rust at the seam above the left side rear wheel. It had not rained for 3 days and when I I was painting a few weeks ago I could see that area was still damp, water coming from the inside through the seam.  The paint is already starting to flake there and not matter how much rust inhibitor I used, etc. that area is going to corrode away real fast again.

Where is that water coming from?????  How do I stop it?

Thanks,
Bryan