I have a CRT rebuilding station

[Tubejunke]

Don't you have to spray phosphur on the inside of the faceplate before you put on the gun? That is for black and white at least. What I'm wondering is this. What do rebuilders do with these color tubes that I think had in some cases a metal screen of some sort behind the faceplate? There would be no way to refurbish that type other than replace the gun I guess. Of course the gun is going to be the problem in a tube needing rebuilding. Is that all they do is replace the gun?

I have an old article from the 40's somewhere about how a crt factory operates. Really neat story with great pictures. That is where I saw them spraying in the phosphur.