1950s or '60s vintage Zenith TVs, Need some info

[Electronic M]

Originally Posted by Notimetolooz

I don't think there is that much corrosion difference between the two. Either is probably OK. If there is a difference it would be hard to prove because any corrosion difference could take decades to show.
Certainly you don't want to use the type that smells like vinegar ( ascetic acid) as it cures.
The black type has a very strong grip on surfaces, more like a glue.
The gasket maker is something that could be removed and re-made.
Either one requires the surface they are applied to be cleaned well with solvent like strong alcohol or acetone to remove any oil, etc.

You want to use ammonia to clean the mating surfaces. The factory glue responds best to ammonia and if you don't clean the factory glue off it will continue to degrade and undermine anything glued to it.