Most of us use clearcoat.
I think he means a quality urethane clear. All that comes in cans is cheap enamel clear which has no UV resistance. The spray can clear may last a long time but urethane clear will last as long as the paint on his car. Not to knock it down, just noting the difference. BTW, I think those tails look great, makes me want to do mine. The clearing doesn't bother me as I have painted a few cars but getting the tint even does. That stuff is pretty thin. How much to get them done professionally?