I used this http://www.sharpie.com/enNZ/Products/Pages/ProductDetails.aspx?pid=SharpieMagnumPermanentMarker(Sharpie%20Catalog) (give it 2-3 times after its dried up).
@Thuekr started
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I used this http://www.sharpie.com/enNZ/Products/Pages/ProductDetails.aspx?pid=SharpieMagnumPermanentMarker(Sharpie%20Catalog) (give it 2-3 times after its dried up).