"Is it ammonia that silicone gives off when it is curing?"
There are many types of silicones and each has its own curing by-products:
Many one part types give off acetic acid (Highly corrosive to sensitive
metals like copper). Some types give off both alcohol and ammonia! which it
sounds like you used. These are not as corrosive but will discolor copper
based metals. It is best to search out the non-corrosive, pure alcohol
byproduct types if you must avoid these consequences. Some of these
specific GE products are: RTV 6700, 5810 and 6800. Most all one part types
require moisture (humidity) to cure, which is great in England but may be
quite slow in Arizona/New Mexico!
For hi-tech applications we use 2 part types, which can cure deep sections
in a closed environment, give off only a little alcohol, and are completely
non-corrosive. They, however, are not practical for general use as they
require many hi tech steps for proper mixing, curing and adhesion.
Good luck with these magical silicones but beware of the after affects!
Especially on brass and plastics. Check with your local industrial supply
house for details.
