That is a thought. However I wonder how it will bond after a couple of days curing now. No question there is plenty of tooth there. We will put a mat in it.
It got dusty just crawling in and out it over the weekend re-assembling things just from the dust on our cloths. A little blast with air cleaned it right up. We'll see what happens. I suppose one could pull a plug and use a little water and stiff brush to scrub it up if the dirt bugs you. It's a trunk.
Since the whole motif is black and blue, Jr and I like the look.
As for hiding rust, one look under the car will answer that question.