Also, when you do clean your glasses, use a glasses safe cleaning cloth. You can put a layer of the chopped fiberglass followed by the woven fiberglass and then do a final chopped again wider than the area you have done....that's real beefy. http://www.localnatural.parks.com/external.php?site=http%3a%2f%2fc-hr-club.tw%2Fhome.php%3Fmod%3Dspace%26uid%3D8345