Thank you for your reply, roughing up the surface you say, you mean like with sandpaper abrasive?
And I see that you noticed the nail polish I have is cheap, yes it is. But that's why I have got this satin sealer. I chose satin over the gloss, because I didn't really know whether we wanted the finished product to be chrome-like, or semi-matt like the istick for example?
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I didn't see your nail polish brand...my eyes aren't that good for a small pic!!...but I have many fun shades here bought in lots from ebay for little money to play with. Sadly my job means using nail polish on nails doesn't work! I would be inclined to rough the surfaces with either a super fine sandpaper or a scotch bright type pad for the finishes to adhere better, although the sandpaper would work easier if roughing gently by hand I would think. Maybe try a small piece first? I don't want to lead you astray...I'm wondering too if some mods might have a protective coat over the metal/plating as well. Random thoughts from the resident machinist here!