Cowl (sealing)

I just want to make sure that its clean inside. Spray bomb some rust neutralizer in there....hopeing to slow whatever rust has started. I want to coat it with "something" just to keep any moisture from hitting the metal and sealing any possible pin holes.

Any mopar that I have / had gets parked indoors. When outside, I always just put a piece of magnetic sign material over the grill when parked - - esp. when raining, just in case.