RCA CT-100 on ebay

[jeyurkon]

Originally Posted by jr_tech

I may be off base here, but I believe that the very tiny leaks that we are trying to stop on CRTs are much too small for a liquid like vacseal to be "sucked into". I look at it as a dense low-vapor pressure coating that essentially provides a second containment wall, in case the first fails. I have painted it around CRT neck pins, base pins and tip seals as a preventive measure. I have no statistically significant proof that it did any good, but in those small quantities, it is pretty cheap per application.
jr

You're not off base. But, Vacseal is intended for small leaks. If the leak is too large it gets sucked in too much and doesn't plug the hole. In smaller leaks it thickens as the solvent evaporates and gets too thick to pass further.

Vacseal is intended to be cured at temperatures above 200C. It cures below that temperature, but not as well. The very property that makes it a good sealant prevents the solvent from evaporating rapidly once a skin has formed. Heat helps.

Unopened bottles have a shelf life of 3yrs. Cans, 3 months. I've had opened bottles that refused to cure even with heat. I suspect it cures much the way shellac does, and doesn't.

The datasheet says that the surface will always seem a little sticky so don't worry about that.

John