The Next Layer of Weathering

An important part of, well pretty much anything you learn, is figuring out how to recover from a mistake or when a problem arises. I wasn't completely happy with the last layer of weathering on this car, but I don't think it's easily removeable. If this was a model I cared about, how would I fix it?

I went back to oils. Since the tinted clear coat should have sealed the initial layer (which is pretty invisible now anyway), I should be able to do this without affecting it. Regardless of whether it's having the effect I wanted, I could at least test this theory...

I picked up a couple of other colors, and worked on a layer using primarily the raw umber as a sort of wash/filter to tint the grime, and also to add a bit of rain streaking from top to bottom.