I detailed my black Mustang a week ago. I used a clay bar, HD Speed, and some Nitro Seal to finish it off. I am really happy with the way it turned out, the Nitro Seal seems to be slicker than the Zaino wax I was using before and only required me to put one coat on. But I heard Nitro Seal has a really short self life after it`s opened, instead of just letting it go bad I was going to put another coat on. Will the second coat bond to the Nitro Seal already on the car (and make it look even better) ?