[jimcarry]

I have not had any brown spots on my copy chrome .
What size kit are you using ? Although you are polishing the piece after you plate it you still need to use a protectent once a year car polish some thing of that nature .Even on real chrome when you are using a chrome polish the polish dose have a protectent in it . I use Turtle wax simple enough Caswells also sells some great products to protect your work. I have used Zoopseal and Liquid metal wax