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Silicone Sealants

Here's some interesting info on silicone sealants from GE's web site -
http://www.ge.com/silicones/gs3.htm   Herb Harris pointed me to this one:

Can I use silicone sealants underwater?

                      GE Silicones does not manufacture silicone sealants
for use in underwater
                      applications. Examples of underwater applications
are: swimming pools,
                      saunas, hot tubs, spas, Jacuzzis, boats or any other
marine vehicles. The only
                      exceptions are the following sealants, which may be
used for sealing small
                      (i.e., 5 gallons or less) aquariums:

                             GE012 -- 10.3 fl. oz. cartridge -- Clear
Silicone Rubber Sealant.
                             GE361 -- 2.8 fl. oz. squeeze tube -- Clear
Household Glue & Seal

                      Application must be as follows:

                             Glass to glass use only
                             Sealant must cure for a minimum of five days
before exposure to water
                             The products listed above should be used as
sealants only, not as
                             structural adhesives.

                      NOTE: Use of other grades of silicone in an aquarium
or failure to let the
                      sealant cure for the proper amount of time could
cause harm to fish or other life
                      forms in the aquarium.