Extreme screen "rot" on a TEC terminal

> middle. It's referred to as "cataracts". I don't know if it's mold, > but it basically results in the breakdown of the PVA bonding compound > that holds the safety glass to the face of the tube. To remove it, at > least on the TV tubes, you take the the tube out of the set, put it > neck down in a large bucket/barrel so that it's supported, and use a > heat gun to heat up the screen. After a while, the PVA will soften, > and the faceplate can be gently separated from the tube. Don't pry it > up - try to gently induce air bubbles under it with wooden shims and > heat. Once the bond breaks over most of the tube, the glass should > come off without breaking. Then you clean out all the PVA gunk, and > reattach the safety glass with packing tape along the edges.