I didn't bookmark my post, so I will summarize...
I bought a used factory shield that had some coating missing where a for sale sign had been taped to it (found in the sun after installation

). So I used some clear packing tape on the shield to finish stripping off the coating. Just lay it on good and then rip it off... Gave my shield a good "waxing".
Now the softer layer under the coating will need regular polishing since it scratches very easy, but will hold you over quite a while before you need to replace it.
Mike "Dodis"