Pro Detailer and DW Supporter
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Colly 476 is a must for winter but it will more than likely remove what you have underneath it to a certain degree....over waxing isnt really necessary just a waste of product as each layer effectively removes a part of the previous layer...2 coats or primarily done for coverage and to ensure all the surface is protected....
I would do is strip the previous layers....for a base layer use EZ Creme Glaze or Wet Mirror Finish from Chemical Guys and top with 476....you will not only get your winter protection but also your shine that you asked for....
Russ