What would be wrong with etching them and then using this paint....
http://www.halfords.com/webapp/wcs/..._productId_174185_langId_-1_categoryId_165495
and then a clear gloss finish to match the diffuser?????
http://www.halfords.com/webapp/wcs/..._productId_174185_langId_-1_categoryId_165495
and then a clear gloss finish to match the diffuser?????
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