I'm wondering what to use to stop any rusting and to preserve the area under the cowl on my '62. I removed all of the "mulch" and dirt inside of this area and it is really solid but has surface rust. I don't plan on removing the fenders at this time or am I planing on repainting the car, just yet. What's recommended to preserve rusted metal in an area that you cannot get to by hand? Thanks in advance... Picture taken with my cheapo endoscope I'll add this to my flower bed!