Freyr, I think what you would find is flat circles or even disks, not unlike giant hub-caps. If I remember rightly, chariot wheels were solid-bodied or armored, as spokes were vulnerable to attack. That leaves a lot of room for decoration, and the gold would have been used as such, not as a surface contact lining.
Such a find doesn’t have to be a plant at all. As Scylla and I both obliquely pointed out, there are alternative–and far more believable–explanations for how chariot wheels might be found in the Red Sea. Both involve a fancy invention that’s been around a long time: boats.
So say you find a bunch of chariot wheels in a line crossing more or less west-east at the bottom of the Red Sea, with no other artifacts around. The best of all possible finds for a Creationist, right?
Wrong. Imagine trying to cross an un-miraculously parted Red Sea with chariots. You’re either going to need a large cargo craft or a towed barge. Now think about what happens when a towed barge carrying chariots gets caught in a storm. The tie-downs are stressed, the load shifts, chariots start falling off or are intentionally pushed overboard, one at a time, leaving a line of sunken chariots exactly as if they had been following one another in line. Same thing happens with a leaking cargo boat desperately trying to lighten its load.
Say you find a bunch of chariot wheel artifacts all bunched together. Oh, my! It’s the sinful pursuers of the Jews huddled together in fear as they face the wrath of God!
Bullshit. It’s a sunken cargo barge, made from non-metal, biodegradeable parts, now not easy to detect. Alternatively, it could be the remnants of a ritual, perhaps an offering of captured or destroyed chariots by the victor to a sea-god, not unlike Scylla’s dump site (take another look at Alfred Hitchcock’s Psycho to see how Scylla’s fender got into the pond–cars float, briefly, before they sink).
As the Red Sea is wide but not too wide to be crossed in a couple of days at most by rowing-power alone, it’s perfectly logical to expect a whole bunch of junk strewn all over its bottom, probably at regular crossing points. Citing such a find as “evidence” of the parting of the Red Sea is a classic example of finding what you want to find, while excluding considered thought.